Cita APA (7a ed.)
(1994). Hart's oil and gas world. Hart Publications.
Cita Chicago Style (17a ed.)
Hart's Oil and Gas World. Denver, Colo.: Hart Publications, 1994.
Cita MLA (9a ed.)
Hart's Oil and Gas World. Hart Publications, 1994.
Precaución: Estas citas no son 100% exactas.