MLA

Aertsen, Henk, and Robert J Jeffers. Historical Linguistics 1989 : Papers From the 9th International Conference On Historical Linguistics. Rutgers University, 14-18 August 1989. Amsterdam [etc.]: John Benjamins, 1993.

APA

Aertsen, H., & Jeffers, R. J. (1993). Historical linguistics 1989 : papers from the 9th international conference on historical linguistics. Rutgers University, 14-18 August 1989. Amsterdam [etc.]: John Benjamins.

Chicago

Aertsen, Henk ed., and Robert J Jeffers ed. Historical Linguistics 1989 : Papers From the 9th International Conference On Historical Linguistics. Rutgers University, 14-18 August 1989. Amsterdam [etc.]: John Benjamins, 1993.