Language proficiency : defining, teaching, and testing. [ca. 1990]. In L. A. Arena (Hrsg.), Topics in language and linguistics [Book]. New York [u.a.]: Plenum Press.

ARENA, Louis A. (Hrsg.). New York [u.a.]: Plenum Press. ISBN 0306437104.

Arena, L. A., Herausgeber. „Language proficiency : defining, teaching, and testing“. Topics in language and linguistics, book, Plenum Press, 1990.

: Language proficiency : defining, teaching, and testing, New York [u.a.] 1990.

Arena, L.A. (Hrsg.). (1990), Language proficiency : defining, teaching, and testing, Topics in language and linguistics, Bd. , Plenum Press, New York [u.a.].