Foreman, P. (2008). The mystery of allegra. Oxford university.
Chicago-čujuhus (17. p.)Foreman, Peter. The Mystery of Allegra. New York: Oxford university, 2008.
MLA-čujuhus (9. p.)Foreman, Peter. The Mystery of Allegra. Oxford university, 2008.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.