Alejandro, R. D., Omar Khayyam, & Sophocles. (1972). Si Omar Khayyam at si Sofocles. MCS Enterprises.
芝加哥风格引文Alejandro, Rufino D., Omar Khayyam, 与 Sophocles. Si Omar Khayyam at Si Sofocles. Manila: MCS Enterprises, 1972.
MLA引文Alejandro, Rufino D., et al. Si Omar Khayyam at Si Sofocles. MCS Enterprises, 1972.
警告：这些引文格式不一定是100％准确.