(1991). Science Year 1992. The World Book Annual Science Supplement: A review of Science and Technology During the 1991 School Year. The World Book,Inc.
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Citácia podle Chicago (17th ed.)
Science Year 1992. The World Book Annual Science Supplement: A Review of Science and Technology During the 1991 School Year. Chicago: The World Book,Inc, 1991.
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Citácia podľa MLA (8th ed.)
Science Year 1992. The World Book Annual Science Supplement: A Review of Science and Technology During the 1991 School Year. The World Book,Inc, 1991.
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