Samelson, W. (1974). English as a second language. Phase One: Let´s converse. Reston Publishing.
Cita Chicago Style (17a ed.)Samelson, William. English as a Second Language. Phase One: Let´s Converse. Virginia, Estados Unidos: Reston Publishing, 1974.
Cita MLA (9a ed.)Samelson, William. English as a Second Language. Phase One: Let´s Converse. Reston Publishing, 1974.
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