Grolier Incorporated, 1965
Buku Referensi
edited by Rolf Toman; translated from German by Paul Auston
H.F. Ullmann, 2010
Buku Teks
edited by Rolf Toman
Konemann, 1998
Buku Teks
Kramrisch, Stella, 1898-1993
The Phaindon Press, 1954
Buku Referensi
Arnason, H. Harvard
Prentice-Hall; H.N. Abrams, 1986
Buku Teks