Cita APA (7a ed.)

Langton, P. H. (1984). A key to pupal exuviae of British Chironomidae. [s.n.].

Cita Chicago Style (17a ed.)

Langton, Peter H. A Key to Pupal Exuviae of British Chironomidae. [s.l.]: [s.n.], 1984.

Cita MLA (9a ed.)

Langton, Peter H. A Key to Pupal Exuviae of British Chironomidae. [s.n.], 1984.