edited by Bernard Rudden and Derrick Wyatt
Oxford University Press, 1993
Buku Teks SO
Hunt, Pearson
Richard D. Irwin, [Date of publication not identified]
Buku Teks SO
Vagts, Detlev F.
Foundation Press, 1973
Buku Teks
Hall, Livingston
West Publishing, 1965
Buku Teks SO
edited by Ernest B. Harper and Arthur Dunham
Associate Press, 1963
Buku Teks SO