- Spanish Verb Tenses: Conjugating Spanish Verbs (Irregular Verbs), Perfecting Your Mastery of Spanish Verbs in all the Tenses (Present, Past, & Future) & Moods (Indicative, Subjunctive, & Conditional) by Brandon Simpson, 2008-07-01
- McGraw-Hill's Essential ESL Grammar: A Handbook for Intermediate and Advanced ESL Students (McGraw-Hill ESL References) by Mark Lester, 2008-03-21
- Yesterday's Verbs: Regular & Irregular Past Tense (Super Duper, BK-264) by Marian Vanden Noven, 1997
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