Ager, D. (1998). The soccer referee's manual (2.). A&C Black.
Chicago Style aipamenaAger, David. The Soccer Referee's Manual. 2. London: A&C Black, 1998.
MLA aipamenaAger, David. The Soccer Referee's Manual. 2. A&C Black, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.