Lenk, John D., author
McGraw-Hill, 1993
Buku Referensi
Lenk, John D., author
McGraw-Hill, 1994
Buku Referensi
Lenk, John D., author
McGraw-Hill, 1995
Buku Referensi
edited by Sybil P. Parker
McGraw-Hill, 1984
Buku Referensi
New York: McGraw-Hill, 2003,
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