Utami, S.D. et al. 2021. Tingkat Keterbacaan Bahan Ajar Flexible Learning Berbasis Kolaboratif Saintifik. Bioscientist : Jurnal Ilmiah Biologi. 9, 2 (Dec. 2021), 577–587. DOI:https://doi.org/10.33394/bioscientist.v9i2.4246.