Social usage and protocol
MLA
Gavino, Roman T, and Robert T Yap-Diangco. Social Usage and Protocol. 2d ed. [Makati: Philippines, 1970
APA, 7th edition
Gavino, R. T, & Yap-Diangco, R. T. (1970). Social usage and protocol. 2d ed. [Makati: Philippines
Chicago, 17th edition
Gavino, Roman T., and Robert T Yap-Diangco. Social usage and protocol. 2d ed. [Makati: Philippines, 1970