Cita APA (7th ed.)

Williams, E. B. (1976). An introductory Portuguese grammar. Dover Publications.

Cita Chicago (17th ed.)

Williams, Edwin Bucher. An Introductory Portuguese Grammar. New York: Dover Publications, 1976.

Cita MLA (9th ed.)

Williams, Edwin Bucher. An Introductory Portuguese Grammar. Dover Publications, 1976.