The Ultimate Guide to Copyright Web Site – This is an incredible site. Regularly updated.
Christian Copyright Licensing International – For music lyric permissions
Copyright Clearance Center – Register your for work for use by others or to obtain permission
How to Cite Material Obtained from the Internet – Chicago Manual of Style (This is the style guide all book publishers use.)
Buy the book, The Copyright Handbook: How to Protect and Use Written Works 14th Edition by Stephen Fishman, Nolo Press (2020).
Buy the book Getting Permission: How to License & Clear Copyrighted Materials Online & Off – Richard Stim, Nolo Press (2019).
Buy the book, Creativity and Copyright: Legal Essentials for Screenwriters and Creative Artists by John L. Geiger and Howard Suber, University of California Press (2019)