APA (7 ম সংস্করণ) উদ্ধৃতি

Varona, I. E. (2008). Opportunity in crisis: Volatile oil prices, environmental woes, spark demand for natural gas vehicles. Philippine Graphic.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Varona, Inday Espina. "Opportunity in Crisis: Volatile Oil Prices, Environmental Woes, Spark Demand for Natural Gas Vehicles." Philippine Graphic 2008.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Varona, Inday Espina. "Opportunity in Crisis: Volatile Oil Prices, Environmental Woes, Spark Demand for Natural Gas Vehicles." Philippine Graphic, 2008.