Master & Margarita
http://cr.middlebury.edu/public/russian/Bulgakov/public_html/index.html
A wonderful resource for students and teachers which contains maps, illustrations, and excerpts from Bulgakov's diary among other text enhancing information. The maps and illustrations provide a visual context for the students to explore Bulgakov's Soviet reality.
Moscow's Magic Realism
https://www.nytimes.com/2016/05/29/books/review/moscows-magic-realism.html
A New York Times book review of Bulgakov's work, which gives both a succinct and detailed overview of Bulgakov's life in the Soviet Union as well as the historical importance of The Master and Margarita.