APA

Hellman K. H., Piotrowski G. K. & Schaefer R. M. (1993). Start catalyst systems employing heated catalyst technology for control of emissions from methanol-fueled vehicles. Warrendale, PA: Society of Automotive Engineers.

Chicago

Hellman Karl H, Piotrowski Gregory K and Schaefer Ronald M. 1993. Start catalyst systems employing heated catalyst technology for control of emissions from methanol-fueled vehicles. Warrendale, PA: Society of Automotive Engineers.

Harvard

Hellman K. H., Piotrowski G. K. and Schaefer R. M. (1993). Start catalyst systems employing heated catalyst technology for control of emissions from methanol-fueled vehicles. Warrendale, PA: Society of Automotive Engineers.

MLA

Hellman Karl H, Piotrowski Gregory K and Schaefer Ronald M. Start catalyst systems employing heated catalyst technology for control of emissions from methanol-fueled vehicles. Warrendale, PA: Society of Automotive Engineers. 1993.