Natanson. M. (ed), Philosophy Of Social Scail Sciences, Random House, New York, 1963 . (28)

The Bulgarian Academy Of Science, Sofia, 1973 . (29)

Hutchinson, London, 1976 . (30)

Scientific Knowledge, Kegan Paul London, 1972 . (31)

Approach, Clarendon Press, Oxford, 1976 . (32)

The High Tide Of Prophyecy, Vol. II, Hegel, Marx And The Aftermath, Routledge & Kegan Paul, London, 1986 . (33)

Roultedege & Kegan Pul, London, 1977 . (34)

Reichenbach H., Relativity Theory And Apriori Knowledge, Trans. & ed. With Introduction By Maria Reichenbach, University Of Chicago Press, 1958 . (35)

Russell B., The Scientific Outlook, George Allan & Unwin, London, 1934 . (36)

Schilpp P. A. (ed.), The Philosophy Of Karl Popper, Two Volumes, Open Court Publishing, IIIinois, 1974 . (37)

Unknown page