Enger, Eldon D., author
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
by Willis H. Johnson...[et al.]
Holt, Rinehart and Winston, 1974
Buku Teks
Vodopich, Darrell S., author
McGraw-Hill , 2005
Buku Teks