Corbin, John Boyd
Phoenix The Oryx Press, 1981
Buku Teks
Tedd, Lucy A.
John Wiley & Sons, 1993
Buku Teks
Couger, J. Daniel
John Wiley & Sons, 1975
Buku Teks
Cota, Erika
[, Springer], 2012
eBooks
Chang, Kang-Tsung, 1943-
McGraw-Hill, 2014
Buku Teks SO