edited by Peter L. Pellet
The United Nations University, 1980
Buku Teks
Aluko, Rotimi E., author
Springer, 2012
eBooks
edited by Robert E.C. Wildman
CRC press, 2007
Buku Teks
Ensminger, Audrey; Ensminger, M.E.; Konlande, James E.; Robson, John R.K.
CRC Press, 1994
Buku Referensi
edited by Edward R. Farnworth
CRC Press, Taylor & Francis Group, 2008
Buku Referensi