W.Y.Gumpol. (1995). Mastery of Sixteen Tenses. Kanisius.
Chicago Style CitationW.Y.Gumpol. Mastery of Sixteen Tenses. Kanisius, 1995.
MLA CitationW.Y.Gumpol. Mastery of Sixteen Tenses. Kanisius, 1995.
Warning: These citations may not always be 100% accurate.