APA
Brooks D. H., Ferrarini Benno & Asian Development Bank. (2012). Vertical gravity. Manila: ADB.
Chicago
Brooks Douglas H, Ferrarini Benno and Asian Development Bank. 2012. Vertical gravity. Manila: ADB.
Harvard
Brooks D. H., Ferrarini Benno and Asian Development Bank. (2012). Vertical gravity. Manila: ADB.
MLA
Brooks Douglas H, Ferrarini Benno and Asian Development Bank. Vertical gravity. Manila: ADB. 2012.