MLA

Flügel, Felix, Johann G Flügel, and J. E Worcester. A Practical Dictionary of the English and German Languages. Leipzig: Richter, 1854.

APA

Flügel, F., Flügel, J. G., & Worcester, J. E. (1854). A practical dictionary of the english and german languages. Leipzig: Richter.

Chicago

Flügel, Felix, and J. E Worcester. A Practical Dictionary of the English and German Languages. Edited by Johann G. Flügel. Leipzig: Richter, 1854.