Starr, Cecie, author
Thomson, 2006
Buku Teks
Dillon, Lawrence S., author
WM.C. Brown, 1976
Buku Teks
Djoni Prawira
DIKTI Depdikbud , 1997
Buku Teks
edited by J.R. Krebs and N.B. Davies
Blackwell, 1995
Buku Teks
Yahner, Richard H., author
Springer, 2012
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