Ashaye, T. I. (2013). Soils, Civilisations and the March of Time. Obafemi Awolowo University Press.
Chicago-čujuhus (17. p.)Ashaye, T. I. Soils, Civilisations and the March of Time. Obafemi Awolowo University Press, 2013.
MLA-čujuhus (9. p.)Ashaye, T. I. Soils, Civilisations and the March of Time. Obafemi Awolowo University Press, 2013.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.