edited by Ralph Cohen
Sheridan Press, 1989
Buku Referensi
Ryan, Michael, 1951-
Wiley-Blackwell, 2017
Buku Teks
edited by Julie Rivkin and Michael Ryan
John Wiley & Sons, 2017
Buku Teks
Krieger, Murray
The Johns Hopkins University Press, 1976
Buku Teks
edited by James S. Holmes
The Hague, 1970
Buku Teks