Fitria, M.; Yanti, W.; Hidayat, F. Deskripsi Pemahaman Konsep Matematis Mahasiswa Berdasarkan Teori APOS Dalam Perkuliahan Daring Materi Turunan: Description of Understanding Student Mathematical Concepts Based on APOS Theory in Online Lectures Derivative Material. nusant. j. of education and soc. science 2024, 1, 25-31.