U.S. Department of Health Human Services, 1988
Buku Teks
edited by Robert S. Wyer and Thomas K. Srull
Hillsdale, New Jersey, 1994
Buku Teks
George Allen and Unwin, 1985
Buku Teks
Hannan, Bill
George Allen and Unwin, 1985
Buku Teks
Herbert, Theodore T., author
Macmillan, 1976
Buku Teks