Gelles, Richard J., author
McGraw-Hill College , 1999
Buku Teks
Frank, Robert H., author
McGraw-Hill/Irwin, 2004
Buku Teks
Malone, Leo J., author
John Wiley & Sons, 1981
Buku Teks
Valentino, Lisa, author
Thomson Wadsworth, 2003
Buku Teks
Hoefnagels, Marielle
McGraw-Hill, Higher Education, 2009
Buku Teks