Prasertkul, L. (1959). Student problems of the U.P. Preparatory high school. s.n.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPrasertkul, Ladda. Student Problems of the U.P. Preparatory High School. [Quezon City: s.n.], 1959.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPrasertkul, Ladda. Student Problems of the U.P. Preparatory High School. s.n.], 1959.
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