Robinson, R., & Jackson, I. J. (1984). People on earth: Human geography. Longman.
Lua i Stíl Chicago (17ú heag.)Robinson, Roger, agus I. J. Jackson. People on Earth: Human Geography. Harlow, Essex, England: Longman, 1984.
Lua MLA (9ú heag.)Robinson, Roger, agus I. J. Jackson. People on Earth: Human Geography. Longman, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.