American Petroleum Institute. (1973). API recommended practice for design, installation, and operation of subsurface safety valve systems. American Petroleum Institute.
Chicago Style (17th ed.) CitationAmerican Petroleum Institute. API Recommended Practice for Design, Installation, and Operation of Subsurface Safety Valve Systems. Dallas, Tex.: American Petroleum Institute, 1973.
MLA (9th ed.) CitationAmerican Petroleum Institute. API Recommended Practice for Design, Installation, and Operation of Subsurface Safety Valve Systems. American Petroleum Institute, 1973.
Warning: These citations may not always be 100% accurate.