Olbes, R. R. (2000). The Philippines: A century hence. Rene Olbes and Associates.
芝加哥风格引文Olbes, Rene R. The Philippines: A Century Hence. Makati City: Rene Olbes and Associates, 2000.
MLA引文Olbes, Rene R. The Philippines: A Century Hence. Rene Olbes and Associates, 2000.
警告：这些引文格式不一定是100％准确.