Hoban, Yvonne
McGraw-Hill, 1988
Buku Teks
Bredow, Miriam, author
Gregg Publishing, 1959
Buku Referensi
Becker, Esther R., author
Harper & Row, 1971
Buku Referensi
Doris, Lillian, author
Prentice-Hall, 1970
Buku Referensi
Stroman, James, author
American Management Association, 2008
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