Scott-James, R.A., author
Longman, 1951
Buku Teks
edited by I.R. Willison
Cambridge University Press, 1972
Buku Referensi
Green, H. M., author
Melbourne University Press, 1951
Buku Teks
Hazeu, H.A.G., author
N.V. Philips Gloeilampenfabrieken, 1971
Buku Teks
Rice, Thomas Jackson, author
Gale Research Company, 1983
Buku Referensi