Using spells from other books?

[nudnic]

I'm working on a book of monsters and other things for DCC. One of the monsters I'm working on would like to cast Disguise Self. There is no Disguise Self but there is Altered Visage from the adventure Emirikol was Framed. Can I use this?

[Mark_Gedak]

You will need to check the open game content declaration in the source product.

Typically, most crunchy things tend to be open content, but each product needs to clearly outline what is an isn't open game content.
Some publishers are more liberal than others.
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If it is listed as open game content then you could reuse it provided you follow the rules of the Open Game License.

[Raven_Crowking]

I'm working on a book of monsters and other things for DCC. One of the monsters I'm working on would like to cast Disguise Self. There is no Disguise Self but there is Altered Visage from the adventure Emirikol was Framed. Can I use this?

May I recommend that you just give the monster the powers it needs without having it be a formal spell? Not only does the core rulebook clarify that monsters don't follow the rules, but it boldly states that NPC spellcasters can and should have powers not available to the PCs.

(Unless they Quest For It, in some cases.)