Cita APA (7a ed.)

Time-Life Books. (1987). Getting firm: Shaping and toning. Time-Life Books.

Cita Chicago Style (17a ed.)

Time-Life Books. Getting Firm: Shaping and Toning. Alexandria, Virginia: Time-Life Books, 1987.

Cita MLA (9a ed.)

Time-Life Books. Getting Firm: Shaping and Toning. Time-Life Books, 1987.