Hawryszkiewycz, Igor Titus
Sydney: Prentice Hall, 1994,
Buku Teks
Hawryszkiewycz, Igor Titus
Prentice-Hall, 1988
Buku Teks
Hawryszkiewycz, Igor Titus
Prentice-Hall, 1998
Buku Teks
Goodman, Seymour E.
McGraw-Hill Kogakusha, 1977
Buku Teks
Hawryszkiewycz, Igor Titus
Prentice-Hall, 1991
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