Eggert, Helmut, author
Ernst & Sohn, 2002
Buku Teks
FAG Kugelfischer Georg Schafer KgaA, [date of publication not identified]
Buku Teks
FAG Kugelfischer Georg Schafer & Co., [date of publication not identified]
Buku Teks
Nguyen-Schafer, Hung, author
Springer Nature, 2019
eBooks
Green, Peter, author
Thames & Hudson, 1989
Buku Teks