Johnson, George, author
McGraw-Hill, 2010
Buku Teks
Smith, Ella Thea, author
Harcourt, Brace & World, 1959
Buku Teks
Lawson, Anton E., author
McGraw-Hill, 1995
Buku Teks
Wallace, Robert A., author
Harper Collins, 1992
Buku Teks
Krogh, David, author
Pearson, 2009
Buku Teks