Twomey, D. P. (1989). Labor & Employment Law, Text & Cases David P. Twomey. South-Western.
Lua i Stíl Chicago (17ú heag.)Twomey, David P. Labor & Employment Law, Text & Cases David P. Twomey. South-Western, 1989.
Lua MLA (8ú heag.)Twomey, David P. Labor & Employment Law, Text & Cases David P. Twomey. South-Western, 1989.
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