Nanda, Serena
Wadsworth, 1994
Buku Teks
Lenkeit, Roberta Edwards, author
McGraw-Hill, 2012
Buku Teks
Rosman, Abraham, author
Random House, 1989
Buku Teks
Crapo, Richley H., author
McGraw-Hill, 2002
Buku Teks
Kluckhohn, Clyde, author
Whittlesey House, 1971
Buku Teks