Mills, Daniel Quinn
McGraw-Hill, 1994
Buku Teks SO
Roberts, Harold S.
University of Hawaii Press, 1970
Buku Teks SO
Roberts, Harold S.
University of Hawaii Press, 1970
Buku Teks SO
Herrick, Neal Q.
Jossey-Bass, 1990
Buku Teks SO
Hanslove, Kurt L.
Cornell University , 1967
Buku Teks SO