Dyfyniad APA

Trimble, W. F. (1982). High frontier: A history of aeronautics in Pennsylvania. Pittsburgh, Pa: University of Pittsburgh Press.

Dyfyniad Arddull Chicago

Trimble, William F. High Frontier: A History of Aeronautics in Pennsylvania. Pittsburgh, Pa: University of Pittsburgh Press, 1982.

Dyfyniad MLA

Trimble, William F. High Frontier: A History of Aeronautics in Pennsylvania. Pittsburgh, Pa: University of Pittsburgh Press, 1982.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.