Cita APA (7th ed.)

Schwartz, E., & Colman, C. (1998). Natural energy: From tired to terrific in 10 days. Putnam.

Cita Chicago (17th ed.)

Schwartz, Erika, i Carol Colman. Natural Energy: From Tired to Terrific in 10 Days. New York: Putnam, 1998.

Cita MLA (9th ed.)

Schwartz, Erika, i Carol Colman. Natural Energy: From Tired to Terrific in 10 Days. Putnam, 1998.