Petersen, William
Macmillan, 1961
Buku Teks
Petersen, William
Macmillan, 1969
Buku Teks
Petersen, William
Macmillan, 1969
Buku Teks
Taeuber, Irene B.
Princeton University Press, 1958
Buku Teks
edited by Stanley Johnson
John Wiley & Sons, 1973
Buku Teks