http://repository.uhamka.ac.id/4498/
Retno Mardhiati A, RMI
http://repository.uhamka.ac.id/4498/1/Tugas%20Terstruktur%201.pdf
Retno Mardhiati A, RMI Tugas Terstruktur 1 MK Biostatistik Inferensial, Semester Ganjil Tahun Akademik 2020/2021. Universitas Muhammadiyah Prof. Dr. HAMKAā€¯. (Unpublished)