editors, Andy Kirkpatrick, Roland Sussex
Springer, 2012
eBooks
Sambrook, G.A.
Longmans, Green, 1947
Buku Teks
William Allan Neilson, editor in chief; Thomas A. Knott, general editor; Paul W. Carhart, managing editor
Springfield, G & C Merriam Co.
Buku Referensi
London Collier-Macmillan 1965,
Buku Teks
Oppenheim, Peter K.
Prentice-Hall, 1976
Buku Teks