Gaya APA
MAY, C, B., MAY, G, S.
(2003).
Effective writing :
(
6th ed.)
.
Boston:
Pearson Education International.
Gaya MLA
MAY, Claire, B.., MAY, Gordon, S..
"Effective writing :".
6th ed.
Boston:
Pearson Education International,
2003.
Buku.