APA citiranje

Schlotfeldt, H. J. (1991). What should I do ?: A practical guide for the freshwater fish farmer. Germany: European Association of Fish Pathologists.

Trích dẫn kiểu Chicago

Schlotfeldt, H. J. What Should I Do ?: A Practical Guide for the Freshwater Fish Farmer. Germany: European Association of Fish Pathologists, 1991.

MLA citiranje

Schlotfeldt, H. J. What Should I Do ?: A Practical Guide for the Freshwater Fish Farmer. Germany: European Association of Fish Pathologists, 1991.