Halstead, L. B. (2013). Ife and Biology. Obafemi Awolowo University Press.
Chicago-čujuhus (17. p.)Halstead, L. B. Ife and Biology. Obafemi Awolowo University Press, 2013.
MLA-čujuhus (9. p.)Halstead, L. B. Ife and Biology. Obafemi Awolowo University Press, 2013.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.