Barr, Donald F.
Percetakan Universitas Cenderawasih, 1979
Buku Klasik
Barr, Donald F.
Hasanuddin University, 1979
Buku Teks
Chidsey, Donald Barr
Crown Publishers, 1959
Buku Teks
Chidsey, Donald Barr
Crowm Publishers, 1962
Buku Teks
Zehna, Peter W., author
Prentice-Hall, 1982
Buku Teks