edited by Coleen K. Withgott, Austin G. Anderson
Merriam-Webster, 1981
Buku Referensi
editor, Jerry Mintz
Macmillan, 1994
Buku Referensi
De Vries, Mary Ann
Prentice-Hall, 1991
Buku Referensi
Pierce, Phyllis S.
Irwin, 1996
Buku Referensi
edited by Shayne Cox Gad
Wiley-Interscience, 2008
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