Bird, R., & Mu, S. (2005). Countdown: A Case Study in Origami Programming.
Lua i Stíl Chicago (17ú heag.)Bird, R., agus S. Mu. Countdown: A Case Study in Origami Programming. 2005.
Lua MLA (9ú heag.)Bird, R., agus S. Mu. Countdown: A Case Study in Origami Programming. 2005.
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