World Health Organization, 1991
Buku Referensi
Kalat, James W.
Thomson/Wadsworth, 2007
Buku Teks
edited by Herman P. Schwan
McGraw-Hill, 1969
Buku Teks
editors: R. T. Bottle, [and] H. V. Wyatt
Butterworth, 1971
Buku Referensi
Truskey, George A.
Pearson/Prentice Hall, 2004
Buku Teks