1 "Lavender." Dictionary of Contemporary Slang. London: Bloomsbury, 2014. Credo Reference. Web. 8 Apr. 2016.
This definition comes from a reputable dictionary of modern English slang usage and etymology. It is a useful additional source for the use of lavender in an LGBT context as well as providing a source for its origin in such a context, which can supplement the existing page's sources on where the slang originated. This fits Wikipedia's source standards because it is a secondary source print book that has undergone numerous revisions and editions and published by a reputable publisher.
2 Sano, Ronni. "Lavender Graduation: Acknowledging the Lives and Achievement of Lesbian, Gay, Bisexual, and Transgender College Students." Journal of College Student Development 41.6 (2000): 643-47. Print.
A paper on the practice of Lavender Graduations, which started in 1995 and are now held at colleges across the country as a way to celebrate LGBT students and their achievements. It is a major current use of the term lavender in an LGBT context so it should be at least mentioned on the Wikipedia page. The source is a peer-reviewed academic journal so it should be reliable.
3 Jay, Karla. Tales of the Lavender Menace : A Memoir of Liberation.New York, NY: Basic Books, 1999. Print.
A memoir on the Lavender Menace movement, which has its own page citing this book. The movement should definitely be included somewhere on the main lavender page as it often comes up when searching for lavender related historical and political content that marked a major turning point for lesbian involvement in feminist discourse. This book is cited on the Wikipedia page for Lavender Menace already, and although it is a primary source not many secondary sources were available on this topic so I chose to include it.