West Publishing, 1989
Buku Referensi
West Publishing, 1985
Buku Referensi
compiled and arranged on an English alphabetical basis by W. E. Clason
Elsevier, 1978
Buku Referensi
Vollnhals, Otto, author
Routledge, 1992
Buku Referensi
Clason, W. E., 1898-, author
Elsevier, 1962
Buku Referensi