Luluk Tri Wulandari
2016
UI - Makalah dan Kertas Kerja
Davidsen, Susanna
[American Library association, American Library association], 2004
eBooks
Varnum, Kenneth J.
Learning Matters, 2012
Buku Teks
University of Bath, 1985
Buku Referensi
Himma Dewiyana
Politeknik Negeri Medan, 2019
Artikel Jurnal