APA (7th ed.) Citation

Tsekouras, D., Ball, W., & Zacharopoulou, D. (1990). The english phrasal verbs worbook key. [s.n].

Chicago Style (17th ed.) Citation

Tsekouras, Dimitri, Wendy Ball, and Dimitra Zacharopoulou. The English Phrasal Verbs Worbook Key. NelSon, U.K: [s.n], 1990.

MLA (9th ed.) Citation

Tsekouras, Dimitri, et al. The English Phrasal Verbs Worbook Key. [s.n], 1990.