Heintz, James A., author
South-Western , 2005
Buku Teks
Heintz, James A., author
South-Western Publishing, 1993
Buku Teks
Woltz, Phebe M., author
McGraw-Hill, 1983
Buku Teks
Woltz, Phebe M., author
McGraw-Hill, 1983
Buku Teks
Voorhis, Robert H. van, author
McGraw-Hill, 1963
Buku Teks