Singer , E. (1969). The practical approach to skill analysis. Mc Graw Hill.
Lua i Stíl Chicago (17ú heag.)Singer , Edwin. The Practical Approach to Skill Analysis. London: Mc Graw Hill, 1969.
Lua MLA (9ú heag.)Singer , Edwin. The Practical Approach to Skill Analysis. Mc Graw Hill, 1969.
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