Keeton, Robert E., author
West Publishing, 1960
Buku Teks
Keeton, Robert E., author
West Publishing Co, 1960
Buku Teks
by Akira Takanashi [and others]
The Japan Institut of Labor , 1997
Buku Teks
Dobbyn, John F., author
West Publishing, 1989
Buku Teks
Dobbyn, John F., author
West Publishing, 1996
Buku Teks