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Hammond, David, Jessica L. Reid, Vicki L. Rynard, Richard O’Connor, Maciej L. Goniewicz, Megan E. Piper, und Maansi Bansal-Travers. "INDICATORS OF DEPENDENCE AND EFFORTS TO QUIT VAPING AND SMOKING AMONG YOUTH IN CANADA, ENGLAND, AND THE USA." Tob Control 2021.

Hammond, David, et al. "INDICATORS OF DEPENDENCE AND EFFORTS TO QUIT VAPING AND SMOKING AMONG YOUTH IN CANADA, ENGLAND, AND THE USA." Tob Control 2021.