Branley, Franklyn M.
Ginn and Company, 1965
Buku Teks
Keosian,John
Reinhold Publishing Corporation, 1964
Buku Teks
by William K. Purves ... [et al.]
Salt lake City Sinauer Associates , 1998
Buku Teks
Belk, Collen
Pearson - Benjamin Cummings, 2008
Buku Teks
Rahn, Joan E., author
Macmillan, 1974
Buku Teks