Bunge, Mario, author
Springer, 2012
eBooks
Zimmer, Heinrich, author
Meridian Books, 1956
Buku Teks
Maxey, Chester C., author
Macmillan, 1961
Buku Teks
by Honorat Aguessy ... [and others]
UNESCO, 1977
Buku Teks
Koller, John M., author
Charles Scribner Sons, 1970
Buku Teks