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Limbong, Mesta and Limbong, Asnah M.N and Palimbong, Agustinus (2021) Survey Online Learning in the Pandemic Time of Covid-19, Case Study at Universitas Kristen Indonesia. Psychology and Education Journal, 58 (2). pp. 6041-6049. ISSN 0033 3077
Tampubolon, Manahan and Samosir, Erikson (2012) Pengembangan Sumberdaya Manusia, Karyawan PT. Jakarta Tourisindo. [Experiment]