Hendrika Saputra, Padilah, Ade Irwansyah Putra Nasution. Effrctivenes Of The Biology Learning During The Covid-19 Pandemic Class X MIPA Mas Al Wasliyah Merbau North Labuhanbatu Regency. IJHESS [Internet]. 2021 Dec. 30 [cited 2025 Oct. 9];1(3). Available from: https://ijhess.com/index.php/ijhess/article/view/74