APA (7th ed.) Citation

LM, C., JW, G., Collins, L. M., & Graham, J. W. (2002). The effect of the timing and spacing of observations in longitudinal studies of tobacco and other drug use: Temporal design considerations. Drug & Alcohol Dependence, 68, S85. https://doi.org/10.1016/s0376-8716(02)00217-x

Chicago Style (17th ed.) Citation

LM, Collins, Graham JW, Linda M. Collins, and John W. Graham. "The Effect of the Timing and Spacing of Observations in Longitudinal Studies of Tobacco and Other Drug Use: Temporal Design Considerations." Drug & Alcohol Dependence 68 (2002): S85. https://doi.org/10.1016/s0376-8716(02)00217-x.

MLA (9th ed.) Citation

LM, Collins, et al. "The Effect of the Timing and Spacing of Observations in Longitudinal Studies of Tobacco and Other Drug Use: Temporal Design Considerations." Drug & Alcohol Dependence, vol. 68, 2002, p. S85, https://doi.org/10.1016/s0376-8716(02)00217-x.