MacCollough, Caleste, author
McGraw-Hill, 1963
Buku Teks
Hoel, Paul Gerhard, 1905-, author
Hughton Mifflin, 1971
Buku Teks
Amos, Jimmy
Harper & Row , 1965
Buku Teks
Leaverton, Paul E., author
EGC, 1987
Buku Teks
King, Imogene M., author
Appletton Century Crofts , 1982
Buku Teks