Gartner, William C.
Van Nostrand Reinhold , 1996
Buku Teks
Hall, C. Michael, author
Pearson Education Limited, 2000
Buku Teks
Routledge, 1996
Buku Teks
Candela, Guido, author
[Springer, ], 2012
eBooks
Universitas Pancasila. Fakultas Pariwisata, {s.a.}
Majalah, Jurnal, Buletin