Cita APA (7a ed.)
Hardy, R. G. (1991). Collins gem dictionarypf English usage (2. Edition.). Harper Collins.
Cita Chicago Style (17a ed.)
Hardy, Ronald G. Collins Gem Dictionarypf English Usage. 2. Edition. Glasgow: Harper Collins, 1991.
Cita MLA (9a ed.)
Hardy, Ronald G. Collins Gem Dictionarypf English Usage. 2. Edition. Harper Collins, 1991.
Precaución: Estas citas no son 100% exactas.