Παραπομπή APA

Cromwell, P. R. (2004). Knots and links -. Cambridge University Press.

Παραπομπή Chicago Style

Cromwell, Peter R. Knots and Links -. Cambridge: Cambridge University Press, 2004.

Παραπομπή MLA

Cromwell, Peter R. Knots and Links -. Cambridge University Press, 2004.