Παραπομπή APA

Topping, J. (1971). Errors of observation and their treatment (3rd ed.). London.

Παραπομπή Chicago Style

Topping, J. Errors of Observation and Their Treatment. 3rd ed. London, 1971.

Παραπομπή MLA

Topping, J. Errors of Observation and Their Treatment. 3rd ed. London, 1971.