Gaya APA

Walker, I.O., Wirl, Franz. (1993). Irreversible price-induced efficiency improvements : theory and empirical application to road transportation I.O. Walker and Franz Wirl . New York: United Nations Publication.

Gaya Chicago

Walker, I.O., Wirl, Franz. Irreversible price-induced efficiency improvements : theory and empirical application to road transportation I.O. Walker and Franz Wirl. New York: United Nations Publication, 1993. Text.

Gaya MLA

Walker, I.O., Wirl, Franz. Irreversible price-induced efficiency improvements : theory and empirical application to road transportation I.O. Walker and Franz Wirl. New York: United Nations Publication, 1993. Text.

Gaya Turabian

Walker, I.O., Wirl, Franz. Irreversible price-induced efficiency improvements : theory and empirical application to road transportation I.O. Walker and Franz Wirl. New York: United Nations Publication, 1993. Print.