Gaya APA
Walvoord, B, E. (1988).
Three steps to revising your writing : for style, grammar, punctuation, and spelling .
Jakarta:
Gramedia.
Gaya MLA
Walvoord, Barbara, E..
"Three steps to revising your writing : for style, grammar, punctuation, and spelling".
Jakarta:
Gramedia,
1988.
Text.