APA
Simons M., Valk P., . (1997). Detection of harmful use of alcohol and drugs among aircrew. Soesterberg: Stichting Nationaal Lucht- en Ruimtevaartgeneeskundig Centrum = National Aerospace Medical Centre, The Netherlands.
Chicago
Simons M, Valk P.J.L, . 1997. Detection of harmful use of alcohol and drugs among aircrew. Soesterberg: Stichting Nationaal Lucht- en Ruimtevaartgeneeskundig Centrum = National Aerospace Medical Centre, The Netherlands.
Harvard
Simons M., Valk P., . (1997). Detection of harmful use of alcohol and drugs among aircrew. Soesterberg: Stichting Nationaal Lucht- en Ruimtevaartgeneeskundig Centrum = National Aerospace Medical Centre, The Netherlands.
MLA
Simons M, Valk P.J.L, . Detection of harmful use of alcohol and drugs among aircrew. Soesterberg: Stichting Nationaal Lucht- en Ruimtevaartgeneeskundig Centrum = National Aerospace Medical Centre, The Netherlands. 1997.