Gaya APA
Howitt, D., Cramer, D. (2000).
First Steps in Research and Statistics: a practical workbook fo psychology students .
London:
Routledge.
Gaya MLA
Howitt, Dennis., Cramer, Duncan.
"First Steps in Research and Statistics: a practical workbook fo psychology students".
London:
Routledge,
2000.
Buku Tercetak.