Gaya APA
Lester, J, D., D., L, J, J. (2010).
Writing Research Papers; A Complete Guide (13).
United States:
Pearson - Longman.
Gaya MLA
Lester, James, D.., D., Lester, Jr,, James.
"Writing Research Papers; A Complete Guide".
13
United States:
Pearson - Longman,
2010.
Textbook.