Ware,Caroline F., Panikkar,K.M., & Romein,J.M. (1966). The twentieth century: Publ. for the Intern. comis. for a history of the scientific and cultural development of mankind. P. 1: Introduction; the development and application of scientific knowledge. London: Allen & Unwin.

Ware,Caroline F., Panikkar,K.M, and Romein,J.M. The Twentieth Century: Publ. for the Intern. Comis. for a History of the Scientific and Cultural Development of Mankind. P. 1: Introduction; the Development and Application of Scientific Knowledge. London: Allen & Unwin, 1966.

Ware,Caroline F., Panikkar,K.M, and Romein,J.M. The Twentieth Century: Publ. for the Intern. Comis. for a History of the Scientific and Cultural Development of Mankind. P. 1: Introduction; the Development and Application of Scientific Knowledge. London: Allen & Unwin, 1966.