Nunnally, Jum C., author
McGraw-Hill, 1970
Buku Teks
Metcalf, Richard W., author
Harcourt Brace Jovanovich, 1990
Buku Teks
Grove, Susan K., author
W.B. Saunders, 1993
Buku Teks
Lucas, Henry C., author
McGraw-Hill, 1981
Buku Teks
Swerdlik, Mark E.
Mayfield Publishing Company, 1999
Buku Teks