The Encyclopedia Americana : volume 26
Grolier, 1994
 Buku Referensi
The Encyclopedia Americana : volume 26
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 26
Americana Corporation, 1964
 Buku Referensi
Encyclopaedia universalis : volume 26
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi
32nd European Symposium on Computer Aided Process Engineering : Volume I
edited by, Ludovic Montastruc, Stephane Negny
Elsevier, 2022
 Buku Teks