@book{20306,
	author = {A. Ross, David||G. Smith, Peter||H. Morrow, Richard},
	title = {Chapter Preface to the third edition},
	url = {https://library.oapen.org/bitstream/20.500.12657/29886/1/Preface%20to%20the%20third%20edition%20-%20Field%20Trials%20of%20Health%20Interventions%20-%20NCBI%20Bookshelf.pdf||https://library.oapen.org/bitstream/20.500.12657/29886/1/Preface%20to%20the%20third%20edition%20-%20Field%20Trials%20of%20Health%20Interventions%20-%20NCBI%20Bookshelf.pdf||https://library.oapen.org/bitstream/20.500.12657/29886/1/Preface%20to%20the%20third%20edition%20-%20Field%20Trials%20of%20Health%20Interventions%20-%20NCBI%20Bookshelf.pdf}
}