Bedford, B. L. (1992). Science year. 1993. The World Book annual science supplement. A review of science and technology. During the 1992 school year ([1st ed.].). [vl. n.].
Citace podle Chicago (17th ed.)Bedford, Barbara L. Science Year. 1993. The World Book Annual Science Supplement. A Review of Science and Technology. During the 1992 School Year. [1st ed.]. Chicago: [vl. n.], 1992.
Citace podle MLA (9th ed.)Bedford, Barbara L. Science Year. 1993. The World Book Annual Science Supplement. A Review of Science and Technology. During the 1992 School Year. [1st ed.]. [vl. n.], 1992.
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