Cita APA (7a ed.)

Elordi Barrena, J. (1982). APL, a programming language. [s.n.].

Cita Chicago Style (17a ed.)

Elordi Barrena, Julián. APL, a Programming Language. [S.l.]: [s.n.], 1982.

Cita MLA (9a ed.)

Elordi Barrena, Julián. APL, a Programming Language. [s.n.], 1982.