Cita APA

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

Chicago Edition Citation

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

Cita MLA

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