https://app.box.com/s/n06649n05jqxfg8zb70w
http://www.academia.edu/3594743/Tugas_Akhir
http://www.sekolahbahasainggris.com/penjelasan-16-tenses-bahasa-inggris-beserta-contoh-kalimat-terlengkap/
http://gurukeguruan.blogspot.co.id/2016/03/kumpulan-administrasi-tu-dan-kepala.html
https://www.facebook.com/permalink.php?story_fbid=188783734599364&id=105461652931573
https://nurhamim86.wordpress.com/komputer/software/100-shortcut-keyboard-dalam-komputer/
http://www.nbcdns.com/2015/12/tombol-shortcut-pada-keyboard-laptop-komputer-pc.html
