APA

Townley Helen M, . (1978). Systems analysis for information retrieval. London : |b A. Deutsch in association with the Institute of Information Scientists: Westview Press.

Chicago

Townley Helen M, . 1978. Systems analysis for information retrieval. London : |b A. Deutsch in association with the Institute of Information Scientists: Westview Press.

Harvard

Townley Helen M, . (1978). Systems analysis for information retrieval. London : |b A. Deutsch in association with the Institute of Information Scientists: Westview Press.

MLA

Townley Helen M, . Systems analysis for information retrieval. London : |b A. Deutsch in association with the Institute of Information Scientists: Westview Press. 1978.