Cita APA (7a ed.)
Gray, J. (1991). Discovering English: A pre-intermediate course (1.vyd.). Mladex.
Cita Chicago Style (17a ed.)
Gray, Joanna. Discovering English: A Pre-intermediate Course. 1.vyd. Bratislava: Mladex, 1991.
Cita MLA (9a ed.)
Gray, Joanna. Discovering English: A Pre-intermediate Course. 1.vyd. Mladex, 1991.
Precaución: Estas citas no son 100% exactas.