Tham khảo Đòn_bẩy

  1. 1 2 Paipetis, S. A.; Ceccarelli, Marco (2010). The Genius of Archimedes -- 23 Centuries of Influence on Mathematics, Science and Engineering: Proceedings of an International Conference held at Syracuse, Italy, June 8-10, 2010. Springer Science & Business Media. tr. 416. ISBN 9789048190911
  2. Bruno, Leonard C.; Olendorf, Donna (1997). Science and technology firsts. Gale Research. tr. 2. ISBN 9780787602567. 4400 B.C. Earliest evidence of the use of a horizontal loom is its depiction on a pottery dish found in Egypt and dated to this time. These first true frame looms are equipped with foot pedals to lift the warp threads, leaving the weaver's hands free to pass and beat the weft thread. 
  3. Clarke, Somers; Engelbach, Reginald (1990). Ancient Egyptian Construction and Architecture. Courier Corporation. tr. 86–90. ISBN 9780486264851
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