Corbin, John Boyd
Phoenix The Oryx Press, 1981
Buku Teks
Tedd, Lucy A.
John Wiley & Sons, 1993
Buku Teks SO
Couger, J. Daniel
John Wiley & Sons, 1975
Buku Teks
Gilmore, Harold L.
John Wiley & Sons, 1969
Buku Teks
Cota, Erika
[, Springer], 2012
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