1. Research in nursing and research training for nurses;Schlotfeldt;Nurs.Res,1975
2. The Grammar of Science;Pearson,1937
3. The Metaphysical Foundations of Modern Physical Science;Burtt,1954
4. Schlotfeldt, op.cit.
5. Ecologists and the public interest;Neljcin;Hastings Center Rep,1976