WHO
Geneva, WHO, 1996, 1996
Buku Teks
Christman, Luther P.
Westview Press, 1981
Buku Teks
Wolper, Lawrence F.
Jones & Bartlett, 2011
Buku Teks
Wolper, Lawrence F.
Jones and Bartlett, 2011
Buku Teks
Sultz, Harry A.
Jones & Bartlett Learning, 2014
Buku Teks