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Buku Teks
Wildermuth, J.R., author
Ecole Hotellere, 1978
Buku Teks
Heri Priatna, author
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UI - Tesis Open
Siregar, Muchtarudin, author
Lembaga Penerbit Fakultas Ekonomi Universitas Indonesia, 1990
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Go, Frank M.
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Buku Teks