edited by William E. Moran
Kenedy , 1965
Buku Teks
Petersen, William, author
Macmillan, 1961
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks
Taeuber, Irene B., author
Princeton University Press, 1958
Buku Teks