Cita APA (7a ed.)

Feil, N., & Klerk-Rubin, V. d. (2003). V/F validation: The Feil method : how to help disoriented old-old (Revised.). Edward Feil Productions.

Cita Chicago Style (17a ed.)

Feil, Naomi, y Vicki de Klerk-Rubin. V/F Validation: The Feil Method : How to Help Disoriented Old-old. Revised. Cleveland, Ohio: Edward Feil Productions, 2003.

Cita MLA (9a ed.)

Feil, Naomi, y Vicki de Klerk-Rubin. V/F Validation: The Feil Method : How to Help Disoriented Old-old. Revised. Edward Feil Productions, 2003.