Carnegie Library of Pittsburgh Science and Technology Department. (1996). Science and technology desk reference: 1.700 answers to frequently-asked or difficult-to-answer questions (2nd ed.). Gale Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Carnegie Library of Pittsburgh Science and Technology Department. Science and Technology Desk Reference: 1.700 Answers to Frequently-asked or Difficult-to-answer Questions. 2nd ed. Detroit: Gale Research, 1996.
Παραπομπή σε μορφή MLA (9th εκδ.)Carnegie Library of Pittsburgh Science and Technology Department. Science and Technology Desk Reference: 1.700 Answers to Frequently-asked or Difficult-to-answer Questions. 2nd ed. Gale Research, 1996.
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