APA (7th ed.) Citation

Helveit, T., & Universitetet i Oslo. Germanistisk seminar. (1949). Differentiating and unifying tendencies in the ablaut system of strong verbs in English. J.G. Tanum.

Chicago Style (17th ed.) Citation

Helveit, Trygve, and Universitetet i Oslo. Germanistisk seminar. Differentiating and Unifying Tendencies in the Ablaut System of Strong Verbs in English. Oslo: J.G. Tanum, 1949.

MLA (8th ed.) Citation

Helveit, Trygve, and Universitetet i Oslo. Germanistisk seminar. Differentiating and Unifying Tendencies in the Ablaut System of Strong Verbs in English. J.G. Tanum, 1949.