Gaya APA

WALVOORD, B, E. (1988). THREE STEPS to REVISING YOUR WRITING for style, grammar, Punctuation, and Spelling . United States of America: UNITED STATES OF AMERICA.

Gaya MLA

WALVOORD, Barbara, E.. "THREE STEPS to REVISING YOUR WRITING for style, grammar, Punctuation, and Spelling". United States of America: UNITED STATES OF AMERICA, 1988. Text.