Eble, Kenneth E., author
Jossey-Bass, 1978
Buku Referensi
Henderson, Algo D., author
Unesco Paris, 1970
Buku Referensi
Baldwin, David A. (David Allen), author
Libraries Unlimited, 2003
Buku Referensi
Curry, David A., author
Addison-Wesley, 1992
Buku Teks
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