Envoy Enterprises. (1990). The Gay & Lesbian Almanac and Events of 1991. Envoy Enterprises.
Chicago-viite (17. p.)Envoy Enterprises. The Gay & Lesbian Almanac and Events of 1991. Chicago: Envoy Enterprises, 1990.
MLA-viite (8. p.)Envoy Enterprises. The Gay & Lesbian Almanac and Events of 1991. Envoy Enterprises, 1990.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.