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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNiño-Vega, Jorge Armando, Diana Patricia López-Sandoval, Eduar Ferney Mora-Mariño, María Alejandra Torres-Cuy, और Flavio Humberto Fernández-Morales. Singapore Method for Teaching Basic Operations with Fractional Numbers in Eight Levels Students. Universidad Pedagógica y Tecnológica de Colombia, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNiño-Vega, Jorge Armando, et al. Singapore Method for Teaching Basic Operations with Fractional Numbers in Eight Levels Students. Universidad Pedagógica y Tecnológica de Colombia, 2020.
