Gaya APA

HOPPER, V, F. (1969). 1001 PITFALLS IN ENGLISH GRAMMER SPELLING AND USAGE . AMERICA: BARRON\'S EDUCATIONAL SERIES.

Gaya MLA

HOPPER, VINCENT, F.. "1001 PITFALLS IN ENGLISH GRAMMER SPELLING AND USAGE". AMERICA: BARRON\'S EDUCATIONAL SERIES, 1969. Text.