Kamm, Antony, author
Harper Collins Pub., 1993
Buku Referensi
edited by Stuart Brown, Diane Collinson, Robert Wilkinson
Roudledge, 1996
Buku Referensi
Scholberg, Henry, author
Switzerland Inter Documentation, 1987
Buku Referensi
Adam and Charles Black, 1969
Buku Referensi
edited by Stanley J. Kunitz, Howard Haycraft
H.W. Wilson, 1961; 1965
Buku Referensi