Cooray, P. G. (2013). The Geological Sciences in the Service of Nigeria. University of Ife Press.
Čikaški stil citiranja (17. izdanje)Cooray, P. G. The Geological Sciences in the Service of Nigeria. University of Ife Press, 2013.
MLA način citiranja (9. izdanje)Cooray, P. G. The Geological Sciences in the Service of Nigeria. University of Ife Press, 2013.
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