APA

Isard W., Langford T. W., . (1971). Regional input-output study: recollections, reflections, and diverse notes on the Philadelphia experience. Cambridge, Mass: MIT Press.

Chicago

Isard Walter, Langford Thomas W, . 1971. Regional input-output study: recollections, reflections, and diverse notes on the Philadelphia experience. Cambridge, Mass: MIT Press.

Harvard

Isard W., Langford T. W., . (1971). Regional input-output study: recollections, reflections, and diverse notes on the Philadelphia experience. Cambridge, Mass: MIT Press.

MLA

Isard Walter, Langford Thomas W, . Regional input-output study: recollections, reflections, and diverse notes on the Philadelphia experience. Cambridge, Mass: MIT Press. 1971.