Nitti, J. J., & Ferreira, M. J. (2005). 501 Portuguese verbs: Fully conjugated in all the tenses, in a new easy-to-learn format, alphabetically arranged (2nd ed.). Hauppauge, N.Y.: Barron's Educational Series.MLA Citation
Nitti, John J., and Michael J Ferreira. 501 Portuguese Verbs: Fully Conjugated in All the Tenses, in a New Easy-to-learn Format, Alphabetically Arranged. 2nd ed. Hauppauge, N.Y.: Barron's Educational Series, 2005.