by Luzviminda Casapao [and others]
Barron's Educational Series, 1983
Buku Teks
Sagebeer, Josephine Evans
Arco Publishing Company, Inc., 1975
Buku Teks
Silvestri, Linda Anne
Saunders, 2009
Multimedia
Silvestri, Linda Anne
Saunders Elsevier, 2009
Buku Teks
by Lisa J. Thiemann ... [and others]
McGraw-Hill , 2006
Buku Teks