APA

Gylfason Thorvaldur,, . (1999). Principles of economic growth. Oxford: Oxford University Press.

Chicago

Gylfason Thorvaldur,, . 1999. Principles of economic growth. Oxford: Oxford University Press.

Harvard

Gylfason Thorvaldur,, . (1999). Principles of economic growth. Oxford: Oxford University Press.

MLA

Gylfason Thorvaldur,, . Principles of economic growth. Oxford: Oxford University Press. 1999.