Todd, Maria K.
CRC Press, Taylor & Francis Group, 2011
Buku Referensi
Chandran, Ravi, author
Prentice-Hall, 2005
Buku Teks
Samsiah Abdul Hamid, author
Cengage Learning, 2012
Buku Teks
Jefferson, Michael
Cavendish Publishing , 1994
Buku Teks
by Akira Takanashi [and others]
The Japan Institut of Labor , 1997
Buku Teks