Awdry, W., & Courtney, R. (2012). Secret of the green engine. Random House.
Lua i Stíl Chicago (17ú heag.)Awdry, W., agus Richard Courtney. Secret of the Green Engine. New York: Random House, 2012.
Lua MLA (8ú heag.)Awdry, W., agus Richard Courtney. Secret of the Green Engine. Random House, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.