Farmer, R.D.T.
Blackwell Scientific Publ., 1977
Buku Teks
Dever, G. E. Alan, author
Aspen Publishers, 1991
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Nies, Marry A., author
Elsevier, 2015
Buku Teks
Springer Publ ., 1974
Buku Teks
Australian Government Publishing Service , 1986
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