4 added 32 characters in body
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Looks like any written source: (http://www.sageadvice.eu/2016/04/26/book-of-shadows/via Twitter):

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scroll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scroll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

Looks like any written source (via Twitter):

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scroll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

3 fixed spelling
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Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scollscroll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scoll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scroll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

2 added 188 characters in body
source | link

Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scoll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

A wizard's spell book, another warlocks Book of Shadows, or a scoll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

Looks like any written source: http://www.sageadvice.eu/2016/04/26/book-of-shadows/

Matt Harrah: "...For Book of Shadows warlock: what constitutes "finding" a ritual spell? A book/scroll? Observation of cast?"

Jeremy Crawford: "...Finding one written down."

A wizard's spell book, another warlocks Book of Shadows, or a scoll all qualify. I could see a DM making one carved on a wall of dungeon, etc, and it would count RAW and RAI.

1
source | link