Dean, Vera Micheles
Harvard University Press, 1948
Buku Teks
Petrov, Vladimir
American Institute fo Public Research, 1975
Buku Teks
edited by William E. Griffith
Lexington Books, 1976
Buku Teks
Moorad, George
E.P. Duttom, 1949
Buku Teks
edited by Alan Ned Sabrosky ; foreword by Charles F. Doran
Westview Press, 1988
Buku Teks