Gatbonton, E. B. (1980). Intramuros: A historical guide. Intramuros Administration.
Chicagoスタイル(17版)引用形式Gatbonton, Esperanza Bunag. Intramuros: A Historical Guide. Manila: Intramuros Administration, 1980.
MLA(9版)引用形式Gatbonton, Esperanza Bunag. Intramuros: A Historical Guide. Intramuros Administration, 1980.
警告: この引用は必ずしも正確ではありません.