APA

Harmer J., . (1999). Trumpet Voluntary. London: Cambridge Univeristy Press.

Chicago

Harmer Jeremy, . 1999. Trumpet Voluntary. London: Cambridge Univeristy Press.

Harvard

Harmer J., . (1999). Trumpet Voluntary. London: Cambridge Univeristy Press.

MLA

Harmer Jeremy, . Trumpet Voluntary. London: Cambridge Univeristy Press. 1999.