http://repository.uhamka.ac.id/4354/
Samsul Maarif, SMF
http://repository.uhamka.ac.id/4354/1/Improving%20Junior%20High%20School%20Students%E2%80%99%20Mathematical%20Analogical%20Ability%20Using%20Discovery%20Learning%20Method.pdf
Samsul Maarif, SMF Hasil Cek Similarity Artikel Jurnal Berjudul “Improving Junior High School Students’ Mathematical Analogical Ability Using Discovery Learning Method”. UHAMKA. (Unpublished)