Soriano, V. J., Gan, K. C., & Hontanosas, C. R. F. (1993). Productivity study report on Castalia Trading (manufacturer-exporter). UP College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSoriano, Virginia J., Kerstin C. Gan, और Carlos Raymund F. Hontanosas. Productivity Study Report on Castalia Trading (manufacturer-exporter). Quezon City: UP College of Engineering, 1993.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSoriano, Virginia J., et al. Productivity Study Report on Castalia Trading (manufacturer-exporter). UP College of Engineering, 1993.
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