Long, Calvin T., author
Pearson - Addison Wesley, 2009
Buku Teks
Cooper, Richard N., author
Oxford University Press, 1991
Buku Teks
Garstens, Helen L., author
Macmillan, 1969
Buku Teks
Radlauer, Ruth, author
Bowmar, 1971
Buku Teks
Gomberg, Karen Cornell, author
McFarland & Co. , 1990
Buku Teks