Westview Press , 1989
Buku Teks
edited by Miguel S. Wionczek
Frederick A. Praeger, 1966
Buku Teks
edited by Howard S. Ellis and Henry C. Wallich
Macmillan, 1963
Buku Teks
edited by Egbert De Vries, Jose Medina Echavarria
UNESCO, 1967
Buku Teks
Southern Methoddist University Press, 1962
Buku Teks