Hunter, Lynne, author
Prentice Hall Regents, 1989
Buku Teks
by Rewey Belle Inglis ... [et al.]
Harcourt, Brace, 1945
Buku Teks
Alexander, L.G., author
Longman, 1967
Buku Teks
Michael McCarthy
1999
Buku Teks
Conklin, Harold C., author
University of California Press, 1953
Buku Referensi