World Health Organization, 1955
Buku Teks
Piddington, Ralph, author
Eidenburgh Oliver , 1960
Buku Teks
Serway, Raymond A., author
Saunders College Publishing, 1990
Buku Teks
Ministry of Justice, 1975
Buku Teks
Adams, John Quincy, author
Russell and Russell, 1962
Buku Teks