http://repository.uhamka.ac.id/id/eprint/11992/ Peer Reviu_Is exemplification the one and only way to describe that empty set is subset of any sets? Samsul Maarif, SMF http://repository.uhamka.ac.id/id/eprint/11992/1/Jurnal%20Inter_Is%20Examplification%20The%20one%20and%20only%20Way.pdf Unduh!