by H.G. Johnson... [and others]
Macmillan, 1968
Buku Teks
Macmillan, 1965
Buku Teks
Macmillan, 1967
Buku Teks
Reder, Melvin Waren
Columbia University Press , 1947
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Harper & Row, 1966
Buku Teks