Gaya APA
Butcher, K, F. et al (1995).
American contexts : a grammar with readings .
Englewood Cliffs, NJ:
Prentice-Hall.
Gaya MLA
Butcher, Kathryn, F.. et al.
"American contexts : a grammar with readings".
Englewood Cliffs, NJ:
Prentice-Hall,
1995.
Text.