APA

Falla T., Davies P. A., . (2008). Solutions. Elementary. Oxford: Oxford University Press.

Chicago

Falla T, Davies P A, . 2008. Solutions. Elementary. Oxford: Oxford University Press.

Harvard

Falla T., Davies P. A., . (2008). Solutions. Elementary. Oxford: Oxford University Press.

MLA

Falla T, Davies P A, . Solutions. Elementary. Oxford: Oxford University Press. 2008.