Vira, Raghu
International Academy of Indian Culture, 1965
Buku Teks
Khaidir Anwar, author
Gadjah Mada University Press, 1985
Buku Teks
Editor by Alan C. Purves; Olive Niles
The National Society for the Study of Education, 1984
Buku Teks
Travel Bureau, 1975
Buku Referensi
Bukh, Alexander, author
Routledge, 2010
Buku Teks