Hubungan Asupan Zink, Kalsium Dan Sosial Ekonomi Keluarga Dengan Prestasi Belajar Siswa Usia 13-15 Tahun Di SMP Nabil Husein Samarinda: The Relationship Between Zinc and Calcium Intake and Family Socioeconomic Status With Academic Achievement of 13-15 Year Old Students at SMP Nabil Husein Samarinda. widyakesehatan 2023, 5 (1), 41-49. https://doi.org/10.32795/widyakesehatan.v5i1.4069.