Fiedler, Hellmut, author
Leipzig Edition, 1973
Buku Teks
Cassidy, Harold G.
Freeman, Cooper & Company , 1970
Buku Teks
editor, A. Gschneidner, LeRoy Eyring
North-Holland, 1982
Buku Referensi
Harrison, Paul, author
John Wiley & Sons, 2001
Buku Teks
Gschneidner, Karl A.
Elsiver Science, 1997
Buku Referensi