edited by Deborah Antai-Otong
W.B. Saunders, 1995
Buku Teks
edited by Samuel M. Turner, Karen S. Calhoun, Henry E. Adams
John Wiley & Sons, 1992
Buku Referensi
Cambridge University Press, 2020
eBooks
Cambridge University Press, 2020
eBooks
Allyn and Bacon, 1994
Buku Teks