Artikel Jurnal
Birkhauser Verlag, 1972
Buku Teks
Kunz, Rainer
Verlag C.H. Beck, 1975
Buku Teks
editorial direction by Martin Nicholas Kunz ; English translation, Robert Kaplan
Daab, 2004
Buku Teks SO
Bueche, Frederick, 1923-
New York McGraw-Hill 1988,
Buku Teks