Παραπομπή APA

Summerskill, M. B. (1989). Laytime (4th ed.). Stevens & Sons.

Παραπομπή Chicago Style

Summerskill, Michael Brynmor. Laytime. 4th ed. London: Stevens & Sons, 1989.

Παραπομπή MLA

Summerskill, Michael Brynmor. Laytime. 4th ed. Stevens & Sons, 1989.