MLA

Beekes, R. S. P. Comparative Indo-european Linguistics : an Introduction. Amsterdam: Benjamin, 1995.

APA

Beekes, R. S. P. (1995). Comparative Indo-European linguistics : an introduction. Amsterdam: Benjamin.

Chicago

Beekes, R. S. P. Comparative Indo-European Linguistics: An Introduction. Amsterdam: Benjamin, 1995.