by Ronald Freedman [and others]; with a chapter by Guy E. Swanson
Henry Holt, 1952
Buku Teks
Goode, William J.
Tata McGraw-Hill, 1977
Buku Teks
Buku Teks
Schrag, Clarence C.
Harper & Row, 1963
Buku Teks
Zanden, James W. Vander
John Wiley & Sons, 1979
Buku Teks