Παραπομπή APA

Hanson,Norwood,Russell. (1971). Observation and explanation: Guide to philosophy of science. George Allen & Unwin.

Παραπομπή Chicago Style

Hanson,Norwood,Russell. Observation and Explanation: Guide to Philosophy of Science. London: George Allen & Unwin, 1971.

Παραπομπή MLA

Hanson,Norwood,Russell. Observation and Explanation: Guide to Philosophy of Science. George Allen & Unwin, 1971.