“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, vol. 5, no. 1, pp. 41–49, May 2023, doi: 10.32795/widyakesehatan.v5i1.4069.