Enger, Eldon D.
McGraw-HIll, 2003
Buku Teks SO
edited by Philip C. Laris, Jack G. Reynolds
Burgess, 1970
Buku Teks SO
Duff, Michael F.
Burgess, 1973
Buku Teks SO
Enger, Eldon D.
McGraw-HIll, 2003
Buku Teks SO
Enger, Eldon D.
McGraw-Hill, Higher Education, 2009
Buku Teks SO