APA-ийн эшлэл(7 дахь хэвлэлт)

Palmer, G. (2004). Writing extra: A resource book of multi-level skills activities. Cambridge University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Palmer, Graham. Writing Extra: A Resource Book of Multi-level Skills Activities. New York: Cambridge University Press, 2004.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Palmer, Graham. Writing Extra: A Resource Book of Multi-level Skills Activities. Cambridge University Press, 2004.