Ellsworth, R. E. (1970). The School library: Facilities for independent study in the secondary school. Educational Facilities Laboratories.
Lua i Stíl Chicago (17ú heag.)Ellsworth, Ralph E. The School Library: Facilities for Independent Study in the Secondary School. U.S.A: Educational Facilities Laboratories, 1970.
Lua MLA (9ú heag.)Ellsworth, Ralph E. The School Library: Facilities for Independent Study in the Secondary School. Educational Facilities Laboratories, 1970.
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