Cita APA (7th ed.)

Armstrong, D. M. (1989). A combinatorial theory of possibility. Cambridge University Press.

Cita Chicago (17th ed.)

Armstrong, D. M. A Combinatorial Theory of Possibility. Cambridge: Cambridge University Press, 1989.

Cita MLA (9th ed.)

Armstrong, D. M. A Combinatorial Theory of Possibility. Cambridge University Press, 1989.