Hovland, C. I. and Lumsdaine, A. A.. "C. COMPARISON OF THE BEFORE-AFTER AND THE AFTER-ONLY DESIGN OF EXPERIMENTS".
Experiments on Mass Communication, Princeton: Princeton University Press, 1971, pp. 308-328.
https://doi.org/10.1515/9781400886807-017Hovland, C. & Lumsdaine, A. (1971). C. COMPARISON OF THE BEFORE-AFTER AND THE AFTER-ONLY DESIGN OF EXPERIMENTS. In
Experiments on Mass Communication (pp. 308-328). Princeton: Princeton University Press.
https://doi.org/10.1515/9781400886807-017Hovland, C. and Lumsdaine, A. 1971. C. COMPARISON OF THE BEFORE-AFTER AND THE AFTER-ONLY DESIGN OF EXPERIMENTS.
Experiments on Mass Communication. Princeton: Princeton University Press, pp. 308-328.
https://doi.org/10.1515/9781400886807-017Hovland, C. I. and Lumsdaine, A. A.. "C. COMPARISON OF THE BEFORE-AFTER AND THE AFTER-ONLY DESIGN OF EXPERIMENTS" In
Experiments on Mass Communication, 308-328. Princeton: Princeton University Press, 1971.
https://doi.org/10.1515/9781400886807-017Hovland C, Lumsdaine A. C. COMPARISON OF THE BEFORE-AFTER AND THE AFTER-ONLY DESIGN OF EXPERIMENTS. In:
Experiments on Mass Communication. Princeton: Princeton University Press; 1971. p.308-328.
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