Higman, B. (1967). A comparative study of programming languages. Elsevier Publishing.
Lua i Stíl Chicago (17ú heag.)Higman, Bryan. A Comparative Study of Programming Languages. New York: Elsevier Publishing, 1967.
Lua MLA (9ú heag.)Higman, Bryan. A Comparative Study of Programming Languages. Elsevier Publishing, 1967.
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