"Senior VP of PETA Dan Mathews: On gay rights, empathy for animals, and getting married under the Las Vegas sign". Interview with Barbi Twins, www.marandapleasantmedia.com.
"Getting from A to Z: Why Animal Activists Should Support Incremental Reforms to Help Animals" by Bruce Friedrich, www.huffingtonpost.com. February 21, 2011.
James Boswell (1791). “The Life of Samuel Johnson, LL.D.: Comprehending an Account of His Studies and Numerous Works, in Chronological Order; a Series of His Epistolary Correspondence and Conversations with Many Eminent Persons; and Various Original Pieces of His Composition, Never Before Published. The Whole Exhibiting a View of Literature and Literary Men in Great-Britain, for Near Half a Century, During which He Flourished. In Two Volumes”, p.71