Cita APA (7th ed.)

Awdry, W., & Courtney, R. (2012). Secret of the green engine. Random House.

Cita Chicago (17th ed.)

Awdry, W., i Richard Courtney. Secret of the Green Engine. New York: Random House, 2012.

Cita MLA (8th ed.)

Awdry, W., i Richard Courtney. Secret of the Green Engine. Random House, 2012.