edited by Martin Tucker
Ungar, 1987
Buku Referensi
Abel, Darrel, author
Barron's Educational Series, 1963
Buku Referensi
edited by Peter Hunt
Oxford University Press, 1995
Buku Referensi
by Rewey Belle Inglis ... [et al.]
Harcourt, Brace, 1945
Buku Teks
program consultants, Beverly Ann Chin ... [et al.]
Glencoe McGraw-Hill, 2000
Buku Teks