J. Ralph Lindgren ... [et al.].
Thomson Wadsworth, 2005
Buku Teks
Little,Brown and Company, 1975
Buku Teks
Indonesia. Departemen Penerangan
Departemen Penerangan RI, 1999
Buku Referensi
Beatty, Jeffrey F., author
South Western Cengage Learning, 2011
Buku Teks
Mashaw, Jerry L, author
Thomson/West, 2009
Buku Teks