Asphalt pavement Design - The Shell Method
https://trid.trb.org/view/60936
Hunter, Robert N., ed. (1994). Bituminous Mixtures in Road Construction. Thomas Telford. p. 80. ISBN 9-78-0-7277-1683-5. 9-78-0-7277-1683-5
Shell Pavement Design Manual—Asphalt Pavements and Overlays for Road Traffic. Shell International Petroleum Company, Ltd., London,. England, 1978
Witczak, Matthew W. (1976). Pavement Performance Models Volume 1. U.S. Army Engineer Waterways Experiment Station. p. 68. https://books.google.com/books?id=8WpIg36XHo0C
Hunter, Robert N. (2000). Asphalts in Road Construction. Thomas Telford. p. 168. ISBN 978-0-7277-2780-0. 978-0-7277-2780-0
AASHTO, 2008, Mechanistic-empirical pavement design guide: A manual of practice