Kobak, C. J. (1979). Don Gaspar de Guevara of Biliran Island, Leyte. IN Historical notes and documentation [column]: A legendary figure or a historical personality? Leyte-Samar Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKobak, Cantius J. "Don Gaspar De Guevara of Biliran Island, Leyte. IN Historical Notes and Documentation [column]: A Legendary Figure or a Historical Personality?" Leyte-Samar Studies 1979.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKobak, Cantius J. "Don Gaspar De Guevara of Biliran Island, Leyte. IN Historical Notes and Documentation [column]: A Legendary Figure or a Historical Personality?" Leyte-Samar Studies, 1979.
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