Ashaye, T. I. (2013). Soils, Civilisations and the March of Time. Obafemi Awolowo University Press.
Cita Chicago (17th ed.)Ashaye, T. I. Soils, Civilisations and the March of Time. Obafemi Awolowo University Press, 2013.
Cita MLA (9th ed.)Ashaye, T. I. Soils, Civilisations and the March of Time. Obafemi Awolowo University Press, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.