Green, A., & Owen, D. (1990). The development of a classification of travel-to-work areas. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Green, A.E, agus D.W Owen. The Development of a Classification of Travel-to-work Areas. Oxford: Pergamon Press, 1990.
Lua MLA (9ú heag.)Green, A.E, agus D.W Owen. The Development of a Classification of Travel-to-work Areas. Pergamon Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.