On June 15 the United State Supreme Court ruled that the 1964 Civil Rights Act bars employers from discriminating against employees based on their sexual preference or gender identity. The majority opinion and the dissents as well as the pleadings are available at Scotusblog:
https://www.scotusblog.com/case-files/cases/bostock-v-clayton-county-georgia/
Social Law Library materials on employment discrimination include:
Employment discrimination [e-book] Volume 1 / by Lex K. Larson ; practice forms by Lex K. Larson and Jonathan R. Harkavy
http://encore.socialaw.com/iii/encore/record/C__Rb1139155
Federal law of employment discrimination in a nutshell / Mack A. Player
http://encore.socialaw.com/iii/encore/record/C__Rb1144791
Sex discrimination and sexual harassment in the workplace / Lawrence Solotoff, Henry S. Kramer
http://encore.socialaw.com/iii/encore/record/C__Rb1034483
Labor and employment in Massachusetts [e-book] Volume 1: a guide to employment laws, regulations, and practices / Jeffrey L. Hirsch
http://encore.socialaw.com/iii/encore/record/C__Rb1140297