SMITH, L. R. (1994). Communications And English For Careers Leila R. Smith, Yolanda V. Grisolia. Prentice - Hall.
Lua i Stíl Chicago (17ú heag.)SMITH, Leila R. Communications And English For Careers Leila R. Smith, Yolanda V. Grisolia. Prentice - Hall, 1994.
Lua MLA (8ú heag.)SMITH, Leila R. Communications And English For Careers Leila R. Smith, Yolanda V. Grisolia. Prentice - Hall, 1994.
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