Loskutov, V
Peace Publishers, [n.d]
Buku Teks
Siskind, Charles S.
McGraw-Hill, 1963
Buku Teks
Gingrich, Harold W.
Prentice-Hall, 1979
Buku Teks
Northcote-Green, James, author
CRC Press, Taylor & Francis, 2007
Buku Teks
Goodloe, Alfred
Franklin Watts, 1984
Buku Teks