C. Hellingman (1992). «Newton's third law revisited». Phys. Educ.27 (2): 112-115. Bibcode:1992PhyEd..27..112H. doi:10.1088/0031-9120/27/2/011. «Quoting Newton in the Principia: It is not one action by which the Sun attracts Jupiter, and another by which Jupiter attracts the Sun; but it is one action by which the Sun and Jupiter mutually endeavour to come nearer together.»
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C. Hellingman (1992). «Newton's third law revisited». Phys. Educ.27 (2): 112-115. Bibcode:1992PhyEd..27..112H. doi:10.1088/0031-9120/27/2/011. «Quoting Newton in the Principia: It is not one action by which the Sun attracts Jupiter, and another by which Jupiter attracts the Sun; but it is one action by which the Sun and Jupiter mutually endeavour to come nearer together.»
«Mecánica cuántica»|url= incorrecta con autorreferencia (ayuda). Wikipedia, la enciclopedia libre. 27 de marzo de 2024. Consultado el 17 de abril de 2024.