Cita APA (7th ed.)
Lahey, T. M., & Walker, T. D. L. (Jun 23, 1996). Elf90 A First Programming Language. Association for Engineering Education - Engineering Library Division Papers.
Cita Chicago (17th ed.)
Lahey, Thomas M., i Thomas D L. Walker. "Elf90 A First Programming Language." Association for Engineering Education - Engineering Library Division Papers Jun 23, 1996.
Cita MLA (9th ed.)
Lahey, Thomas M., i Thomas D L. Walker. "Elf90 A First Programming Language." Association for Engineering Education - Engineering Library Division Papers, Jun 23, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.