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.