National Education Association of the United States, 1964
Buku Teks
Heyel, Carl, author
American Management Association, 1960
Buku Teks
Rubin, Herbert J.
Macmillan, 1992
Buku Teks
edited by Ada K. Jacox, Catherine M. Norris
Appleton-century-crofts , 1977
Buku Teks
Murata, Satoshi, author
[, Springer], 2012
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