Pauk, Walter, author
Houghton Mifflin, 1984
Buku Teks
Syadzwina Hasyyati Taqwa, athor
2016
UI - Skripsi (Membership)
Rosdiana Galuh Sartika, author
Fakultas Psikologi Universitas Indonesia, 2016
UI - Skripsi (Membership)
Majors, Randall E., author
Prentice-Hall, 1997
Buku Teks
The Council on Hotel, Restaurant and Institutional Education (CHRIE)
John Willey & Sons, 1995
Buku Referensi