Beck, Raymond W., author
Burgess, 1977, 1977
Buku Teks
Weisz, Paul B., author
McGraw-Hill, 1963
Buku Teks
Johnson, Willis H., author
Holt, Rinehart and Winston, 1961
Buku Teks
Ehrlich, Paul R., author
McGraw-Hill, 1976
Buku Teks
Weisz, Paul B., author
McGraw-Hill, 1982
Buku Teks