1. C.H. Fenichel: "Online information retrieval: identification of measures that discriminate among users with different levels and types of experience." Ph.D. Dissertation,Drexel University, 1979.
2. D.T. Hawkins: 'On-line Information Retrieval Bibliography, 1965-1976'. Supplement to Online Review, 1977, 1 (1), pp.S1-S1to S1-20.
3. Online information retrieval bibliography