@unpublished{repository11996,
           title = {Peer Reviu\_Depicting Epistemological Obstacles in Understanding the 
Concept of Sequence and Series},
            note = {Unpublished},
       publisher = {UHAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/11996/},
          author = {Samsul Maarif, SMF}
}