Παραπομπή APA

Holton,C.A, & Sheehan,J. (1993). Peterson graph. Cambridge University press.

Παραπομπή Chicago Style

Holton,C.A, και Sheehan,J. Peterson Graph. Cambridge: Cambridge University press, 1993.

Παραπομπή MLA

Holton,C.A, και Sheehan,J. Peterson Graph. Cambridge University press, 1993.