APA

Dahlberg A. O., . (1956). National income visualided. New York: Columbia University Press.

Chicago

Dahlberg Arthur Olaus, . 1956. National income visualided. New York: Columbia University Press.

Harvard

Dahlberg A. O., . (1956). National income visualided. New York: Columbia University Press.

MLA

Dahlberg Arthur Olaus, . National income visualided. New York: Columbia University Press. 1956.