APA
American Petroleum Institute A., . (1994). Specification for internal-combustion reciprocating engines for oil-field service. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 1994. Specification for internal-combustion reciprocating engines for oil-field service. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (1994). Specification for internal-combustion reciprocating engines for oil-field service. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Specification for internal-combustion reciprocating engines for oil-field service. Washington: American Petroleum Institute, API. 1994.