Here are some academic databases containing scholarly information for drama and theater:
Multidisciplinary digital library of academic journals, books, and primary sources.
Primary and critical text database for literary research at all levels. Provides full text access to more than 500,000 works of poetry, drama and prose stretching from the 8th century through the present day, including primary resource collections from diverse and modern authors.
Ghost Light: An Introductory Handbook for Dramaturgy by 
Shakespeare's Ear: Dark, Strange, and Fascinating Tales from the World of Theater by 
A Teen Drama Student's Guide to Laying the Foundation for a Successful Acting Career by 
Letters to a Young Actor: A Universal Guide to Performance by 
Local Acts: Community-Based Performance in the United States by 
Writing, Directing, and Producing Documentary Films and Digital Videos, Fifth Edition by 
Screenwriting for Neurotics:A Beginner's Guide to Writing a Feature-Length Screenplay from Start to Finish by 
Stage Fright: 40 Stars Tell You How They Beat America's #1 Fear by 
