APA
Walker M., . (1963). The nature of scientific thought. Prentice-hall, New Jersey: .
Chicago
Walker Marshall, . 1963. The nature of scientific thought. Prentice-hall, New Jersey: .
Harvard
Walker M., . (1963). The nature of scientific thought. Prentice-hall, New Jersey: .
MLA
Walker Marshall, . The nature of scientific thought. Prentice-hall, New Jersey: . 1963.