Cita APA (7a ed.)

Schwartz, A., & Rounds, G. (1972). A twister of twists, a tangler of tongues: Tongue twisters. Lippincott.

Cita Chicago Style (17a ed.)

Schwartz, Alvin, y Glen Rounds. A Twister of Twists, a Tangler of Tongues: Tongue Twisters. Philadelphia: Lippincott, 1972.

Cita MLA (9a ed.)

Schwartz, Alvin, y Glen Rounds. A Twister of Twists, a Tangler of Tongues: Tongue Twisters. Lippincott, 1972.