Meade, Teresa A.
Wiley-Blackwell, 2010
Buku Teks
Skidmore, Thomas E.
Oxford University Press, 2001
Buku Teks
Skidmore, Thomas E.
Oxford University Press, 1984
Buku Teks
Martin, Michael Rheta
The Bobbs Merrill, 1968
Buku Referensi
Wilgus, A. Curtis
Barner & Noble, 1963
Buku Teks