Kroethnert, G. (2004). Basic training for trainers (3rd.). TMH.
Lua i Stíl Chicago (17ú heag.)Kroethnert, Gary. Basic Training for Trainers. 3rd. New Delhi: TMH, 2004.
Lua MLA (9ú heag.)Kroethnert, Gary. Basic Training for Trainers. 3rd. TMH, 2004.
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