Rentauli Mariah Silalahi. (2019). UNDERSTANDING VYGOTSKY'S ZONE OF PROXIMAL DEVELOPMENT FOR LEARNING. Universitas Pelita Harapan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRentauli Mariah Silalahi. UNDERSTANDING VYGOTSKY'S ZONE OF PROXIMAL DEVELOPMENT FOR LEARNING. Universitas Pelita Harapan, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRentauli Mariah Silalahi. UNDERSTANDING VYGOTSKY'S ZONE OF PROXIMAL DEVELOPMENT FOR LEARNING. Universitas Pelita Harapan, 2019.
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