Cita APA

Public Affairs Information Service, Picon, A., & Sloan, G. (1990). PAIS subject headings (2nd ed.). Public Affairs Information Service.

Citación estilo Chicago

Public Affairs Information Service, Alice Picon, and Gwen Sloan. PAIS Subject Headings. 2nd ed. [New York]: Public Affairs Information Service, 1990.

Cita MLA

Public Affairs Information Service, et al. PAIS Subject Headings. 2nd ed. Public Affairs Information Service, 1990.