Woltz, Phebe M., author
McGraw-Hill, 1983
Buku Teks
Voorhis, Robert H. van, author
McGraw-Hill, 1963
Buku Teks
McQuaig, Douglas J.
Houghton Mifflin, 1989
Buku Teks
Linnaus, Vernon F.
Harcourt Brace Jovanovich, Inc., 1977
Buku Teks
Wheeler, James E., author
Richard D. Irwin , 1981
Buku Teks