Gahart, Betty L., author
Mosby , 1995
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Gahart, Betty L., author
Mosby Elsevier, 2010
Buku Teks
Gahart, Betty L., author
ElSEVIER Mosby, 2012
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Fulcher, Eugenia M., author
Elsevier Saunder, 2012
Buku Teks
Northouse, Peter G., author
Prentice-Hall, 1985
Buku Referensi