Gatbonton, E. B. (1985). Bastion de San Diego. Intramuros Administration, Ministry of Human Settlements.
芝加哥风格引文Gatbonton, Esperanza Bunag. Bastion De San Diego. Manila: Intramuros Administration, Ministry of Human Settlements, 1985.
MLA引文Gatbonton, Esperanza Bunag. Bastion De San Diego. Intramuros Administration, Ministry of Human Settlements, 1985.
警告：这些引文格式不一定是100％准确.