Jones, Clarence Fielden
Macmillan, 1968
Buku Teks
by Les Rowntree ... [and others]
Prenticel Hall, 2008
Buku Teks
Getis, Arthur, author
McGraw-Hill Higher Education, 2009
Buku Teks
Kendall, Henry M., author
Harcourt, Brace, 1958
Buku Teks
Getis, Arthur, author
McGraw-Hill, 2000
Buku Teks