Boskma, Pieter
In de Knipscheer, 1991
Buku Teks
Wynhausen, Elisabeth
Penguin Books, 1990
Buku Teks SO
Mack, Maynard, 1909-2001, editor
W.W.Norton & Company INC, 1974
Buku Teks SO
Henderson, H. James
McGraw-Hill, 1974
Buku Teks SO
Woodhead, 2014
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