Nowak, Norman D., author
Praeger, 1970
Buku Teks
Prakash, Om, author
Frederick A. Praeger, 1962
Buku Teks
United Nations , 1961
Buku Teks
Tobias Soebekti
Indiana University, 1964
Buku Teks
Benson, George C.S., author
Harvard University Press, 1935
Buku Teks