Beyer, T. R. (2013). 501 English verbs: Fully conjugated in all the tenses in a new, easy-to-learn format, alphabetically arranged (Third Edition.). Barron's.
Cita Chicago Style (17a ed.)Beyer, Thomas R. 501 English Verbs: Fully Conjugated in All the Tenses in a New, Easy-to-learn Format, Alphabetically Arranged. Third Edition. Hauppauge, NY: Barron's, 2013.
Cita MLA (8a ed.)Beyer, Thomas R. 501 English Verbs: Fully Conjugated in All the Tenses in a New, Easy-to-learn Format, Alphabetically Arranged. Third Edition. Barron's, 2013.
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