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References

  • 1
    Jadad AR, Enkin MW. Randomized Controlled Trials: Questions, Answers and Musings. 2nd ed. Oxford: Blackwell Publishing, 2007.
  • 2
    Enkin M, Keirse MJNC, Neilson J, Crowther C, Duley L, Hodnett E, Hofmeyr J. A Guide to Effective Care in Pregnancy and Childbirth. 3rd ed. Oxford: Oxford University Press, 2000.
  • 3
    Chalmers I, Enkin MW, Keirse MJNC. Effective Care in Pregnancy and Childbirth. Oxford: Oxford University Press, 1989.