Gaya APA

(API), A, P, I. (1988). Specification for high pressure fiberglass line pipe. API Specification 15HR (SPEC 15HR). (1988). : Washington DC : American Petroleum Inst.,.

Gaya MLA

(API), American, Petrol., Inst.. "Specification for high pressure fiberglass line pipe. API Specification 15HR (SPEC 15HR).". 1988 : Washington DC : American Petroleum Inst.,, 1988. Text.