Stewart, Douglas Alexander, 1913-, author
Angus and Robertson, 1968
Buku Teks
Sun Books, 1970
Buku Teks
Bellman, Richard, author
Academic Press, 1973
Buku Teks
Alonso, Marcelo, 1921-, author
Addison-Wesley, 1967
Buku Teks
World Health Organization, 1955
Buku Teks