edited by Francois Grosjean and Uli H. Frauenfeder
Psychology Press, 1997
Buku Teks SO
[Canberra] Angus & Robertson 1989,
Buku Referensi
[T.t.] West-Java Regional Touris Development Board [t.th.]
Buku Teks
Mastra, Riadika
Jakarta : Kelompok Gramedia, 2007
Buku Referensi
Martin, Samuel E.
Rutland Charles E. Tuttle Company 1992
Buku Referensi