McCourt, Richard M.
McGraw-Hill, 1990
Buku Referensi
Enger, Eldon D.
McGraw-Hill, 2009
Buku Teks
Enger, Eldon D.
McGraw-Hill, Higher Education, 2009
Buku Teks
edited by Philip C. Laris, Jack G. Reynolds
Burgess, 1970
Buku Teks
by Margaret J. Hartman [and others]
Kendall/Hunt, 1976
Buku Teks