Principles of the history of language,
by Hermann Paul. Translated from the second edition of the original by H. A. Strong.

APA Citation

Paul, H., Strong, H. A. (Herbert Augustus). (1888). Principles of the history of language. London: S. Sonnenschein.

MLA Citation

Paul, Hermann, 1846-1921, and Herbert A. (Herbert Augustus) Strong. Principles of the History of Language. London: S. Sonnenschein, 1888.

Warning: These citations may not always be complete (especially for serials).