Cita APA (7a ed.)

Williams, M. A. J., & Adamson, D. A. (1982). A land between two Niles: Quaternary geology and biology of the Central Sudan. A.A. Balkema.

Cita Chicago Style (17a ed.)

Williams, M. A. J., y D. A. Adamson. A Land Between Two Niles: Quaternary Geology and Biology of the Central Sudan. Rotterdam: A.A. Balkema, 1982.

Cita MLA (9a ed.)

Williams, M. A. J., y D. A. Adamson. A Land Between Two Niles: Quaternary Geology and Biology of the Central Sudan. A.A. Balkema, 1982.