Citazione Stile APA (7a Edizione)

Williams, W. K., & Mumu, J. (2012). Comprehensive geography (Revised edition, new syllabus.). Longhorn Publishers.

Citazione stile Chigago Style (17a edizione)

Williams, Winfred Kambua, e Julia Mumu. Comprehensive Geography. Revised edition, new syllabus. Nairobi, Kenya Dar es Salaam, Tanzania Kampala, Uganda: Longhorn Publishers, 2012.

Citatione MLA (9a ed.)

Williams, Winfred Kambua, e Julia Mumu. Comprehensive Geography. Revised edition, new syllabus. Longhorn Publishers, 2012.