Gaya APA

Engineers, S, O, P. (1990). Hydraulic fracturing 2. SPE reprint series no. 28 (1990). : Richardson : Sociatey of Petroleum Engineers,.

Gaya MLA

Engineers, Society, Of, Petroleum. "Hydraulic fracturing 2. SPE reprint series no. 28". 1990 : Richardson : Sociatey of Petroleum Engineers,, 1990. Text.