APA

Hellwig J., . (1969). Introduction to computers and programming. New York: Columbia University Press.

Chicago

Hellwig Jessica, . 1969. Introduction to computers and programming. New York: Columbia University Press.

Harvard

Hellwig J., . (1969). Introduction to computers and programming. New York: Columbia University Press.

MLA

Hellwig Jessica, . Introduction to computers and programming. New York: Columbia University Press. 1969.