Gimlette, John D., author
Oxford University Press, 1971
Buku Teks
Roucek, Joseph S., author
Stanford University Press, 1949
Buku Teks
Sanger, Richard H., author
Cornell University Press, 1954
Buku Teks
O`Leary, De Lacy
K. Paul, Trench, Trubner & co, 1927
Buku Teks
Groeneveldt, W. P. (Willem Pieter), 1841-1915, author
Bhratara, 1960
Buku Teks