Παραπομπή σε μορφή APA (7η εκδ.)

Lu, Y. (1997). Theoretical and experimental studies of a long stroke pumping unit with an auto-mechanical reverse mechanism and a sliding counterweight. Oulun yliopisto.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Lu, Yi. Theoretical and Experimental Studies of a Long Stroke Pumping Unit with an Auto-mechanical Reverse Mechanism and a Sliding Counterweight. Oulu: Oulun yliopisto, 1997.

Παραπομπή σε μορφή MLA (8th εκδ.)

Lu, Yi. Theoretical and Experimental Studies of a Long Stroke Pumping Unit with an Auto-mechanical Reverse Mechanism and a Sliding Counterweight. Oulun yliopisto, 1997.