Cita APA (7th ed.)

Beard, R. E., Pentikäinen, T., & Pesonen, E. (1969). Risk theory. Methuen.

Cita Chicago (17th ed.)

Beard, Robert Eric, Teivo Pentikäinen, i Erkki Pesonen. Risk Theory. Londres: Methuen, 1969.

Cita MLA (9th ed.)

Beard, Robert Eric, et al. Risk Theory. Methuen, 1969.