Cita APA (7a ed.)

Fowler, W., & Coe, N. (1987). Quickcheck placement tests (New ed.). [s.n].

Cita Chicago Style (17a ed.)

Fowler, W.S, y Norman Coe. Quickcheck Placement Tests. New ed. NelSon, U.K: [s.n], 1987.

Cita MLA (9a ed.)

Fowler, W.S, y Norman Coe. Quickcheck Placement Tests. New ed. [s.n], 1987.