Cita APA (7a ed.)

Hopkins, M., & King, T. (2005). Groundwork: Junior certificate geography. The Educational Company.

Cita Chicago Style (17a ed.)

Hopkins, Monica, y Therese King. Groundwork: Junior Certificate Geography. Dublin: The Educational Company, 2005.

Cita MLA (9a ed.)

Hopkins, Monica, y Therese King. Groundwork: Junior Certificate Geography. The Educational Company, 2005.