APA

Lewis J., Tierney W., . (1980). United parcel service applies Texaco stratified charge engine technology to power parcel delivery vans. Progress report. Warrendale, PA: SAE technical paper 80 14 29.

Chicago

Lewis JM, Tierney WT, . 1980. United parcel service applies Texaco stratified charge engine technology to power parcel delivery vans. Progress report. Warrendale, PA: SAE technical paper 80 14 29.

Harvard

Lewis J., Tierney W., . (1980). United parcel service applies Texaco stratified charge engine technology to power parcel delivery vans. Progress report. Warrendale, PA: SAE technical paper 80 14 29.

MLA

Lewis JM, Tierney WT, . United parcel service applies Texaco stratified charge engine technology to power parcel delivery vans. Progress report. Warrendale, PA: SAE technical paper 80 14 29. 1980.