Cita APA (7a ed.)

Marcotty, M., & Ledgard, H. F. (1987). The world of programming languages. Springer.

Cita Chicago Style (17a ed.)

Marcotty, Michael, y Henry F. Ledgard. The World of Programming Languages. New York [etc.]: Springer, 1987.

Cita MLA (9a ed.)

Marcotty, Michael, y Henry F. Ledgard. The World of Programming Languages. Springer, 1987.