APA (7th ed.) Citation

Poerwo, H. H. (1993). Irregular Verbs/helly Handoko Poerwo. Kanisius.

Chicago Style (17th ed.) Citation

Poerwo, Helly Handoko. Irregular Verbs/helly Handoko Poerwo. Kanisius, 1993.

MLA (8th ed.) Citation

Poerwo, Helly Handoko. Irregular Verbs/helly Handoko Poerwo. Kanisius, 1993.

Warning: These citations may not always be 100% accurate.