http://repository.uhamka.ac.id/id/eprint/12001/
Peer Reviu_Obstacles in Constructing Geometrical Proofs of Mathematics-TeacherStudents Based on Boero’s Proving Model
Samsul Maarif, SMF
http://repository.uhamka.ac.id/id/eprint/12001/1/Prosiding_Obstcle%20in%20Construction%20geometry.pdf