APA

de Grahl W., . (1984). the parrot family. New York: arco.

Chicago

de Grahl W, . 1984. the parrot family. New York: arco.

Harvard

de Grahl W., . (1984). the parrot family. New York: arco.

MLA

de Grahl W, . the parrot family. New York: arco. 1984.