Spencer, D. L. (1970). Technology gap in perspective: Strategy of international technology transfer. Spartan.
Citazione stile Chigago Style (17a edizione)Spencer, Daniel Lloyd. Technology Gap in Perspective: Strategy of International Technology Transfer. New York: Spartan, 1970.
Citatione MLA (9a ed.)Spencer, Daniel Lloyd. Technology Gap in Perspective: Strategy of International Technology Transfer. Spartan, 1970.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.