Machale, J. (1977). The futures directory: An International Listing and Description of Organizations and Individuals Active in future studies and long-range planning. IPC Business Press.
Chicago-Zitierstil (17. Ausg.)Machale, John. The Futures Directory: An International Listing and Description of Organizations and Individuals Active in Future Studies and Long-range Planning. London: IPC Business Press, 1977.
MLA-Zitierstil (9. Ausg.)Machale, John. The Futures Directory: An International Listing and Description of Organizations and Individuals Active in Future Studies and Long-range Planning. IPC Business Press, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.