Castro, P. A. (1983). Philippine bilateral air agreements. Foreign Service Institute.
芝加哥风格引文Castro, Pacifico A. Philippine Bilateral Air Agreements. Manila: Foreign Service Institute, 1983.
MLA引文Castro, Pacifico A. Philippine Bilateral Air Agreements. Foreign Service Institute, 1983.
警告：这些引文格式不一定是100％准确.