edited by Dagobert D. Runes and Harry G. Schrickel
Philosophical Library, 1946
Buku Referensi
Tokyo Dainicchiseka Color & Chemicals [T.th.]
Buku Teks
Norwich, John Julius, editor
Oxford University Press, 1990
Buku Referensi
Riley, Noel, editor
Free Press, 2003
Buku Referensi
arranged and edited by Wolfgang Hageney
Belvedere, 1989
Buku Teks SO