(1994). Eurobarometer 35.1 Public Transportation and Biotechnology, March-April 1991 / Karlheinz Reif, Anna Melich. [electronic resource].
Cita Chicago (17th ed.)Eurobarometer 35.1 Public Transportation and Biotechnology, March-April 1991 / Karlheinz Reif, Anna Melich. [electronic Resource]. 1994.
Cita MLA (9th ed.)Eurobarometer 35.1 Public Transportation and Biotechnology, March-April 1991 / Karlheinz Reif, Anna Melich. [electronic Resource]. 1994.
Atenció: Aquestes cites poden no estar 100% correctes.