Παραπομπή APA

Williams, M. (2003). A preface to Hardy. Pearson Education.

Παραπομπή Chicago Style

Williams, Merryn. A Preface to Hardy. Singapore: Pearson Education, 2003.

Παραπομπή MLA

Williams, Merryn. A Preface to Hardy. Pearson Education, 2003.