Cita APA (7a ed.)

Patterson, D. J., & Hedley, S. (1992). Free-Living freshwater protozoa a colour guide (1a ed.). [s.n.].

Cita Chicago Style (17a ed.)

Patterson, Donald J., y Stuart Hedley. Free-Living Freshwater Protozoa a Colour Guide. 1a ed. Aylesbury: [s.n.], 1992.

Cita MLA (9a ed.)

Patterson, Donald J., y Stuart Hedley. Free-Living Freshwater Protozoa a Colour Guide. 1a ed. [s.n.], 1992.