Ryan, Thomas A., author
Irene Rubin, 1976
Buku Teks
Ryan, Barbara, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
edited by George R. Davis
McGraw-Hill, 1982
Buku Teks
editor, C.H. Chen
Imperial College Press, 2010
Buku Referensi
McGraw-Hill, 2003
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