Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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