Vance, Charles C., author
McGraw-Hill, 1974
Buku Teks
Roosevelt, Eleanor, author
Harper & Brothers, 1953
Buku Teks
Duncan, Tom, author
John murray, 1985
Buku Teks
Morley, Deborah, author
Course Technology Cengage Learning, 2013
Buku Teks
Christie, Linda Gail, author
Jones-Irwin, 1986
Buku Teks