USDHEW, 1970
Buku Teks
Gatchalian, Jose C., author
Asian Labor Education Center, 1975
Buku Teks
Piercy, Fred P.
The Guilford Press, 1986
Buku Teks
Skolnick, Arlene S.
Little, Brown and company, 1983
Buku Teks
Kidman, Antony
Biochemical & General Services, 1995
Buku Teks