APA (7 वां संस्करण) प्रशस्ति पत्र
Azeiteiro, U., Leal Filho, W., & Caeiro, S. (2014). E-learning and education for sustainability. PL Academic Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Azeiteiro, Ulisses, Walter Leal Filho, और Sandra Caeiro. E-learning and Education for Sustainability. Frankfurt am Main, [Germany]: PL Academic Research, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Azeiteiro, Ulisses, et al. E-learning and Education for Sustainability. PL Academic Research, 2014.
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