An analysis paragraph writing of the sixth semester students of HKBP Nommensen university
 Artikel Jurnal
Brannan, Bob
A writer's workshop: crafting paragraphs, building essays
McGraw-Hill , 2003
 Buku Teks
Langan, John, 1942-
Sentence skills : a workbook for writers
McGraw-Hill, 1994
 Buku Teks
Alexander, L.G.
Developing skills : an integrated course for intermediate students
Longman, 1964
 Buku Teks
Spaventa, Lou J.
Writing to learn : from paragraph to essay
McGraw-Hill, 2001
 Buku Teks