To cite package 'longpower' in publications use:

Michael C Donohue, (2019). longpower: Power and sample size calculations for longitudinal data. R package version 1.0-19.

Diggle PJ, Heagerty PJ, Liang K, Zeger SL. Analysis of longitudinal data. Second Edition. Oxford Statistical Science Serires. 2002.

Liu, G., & Liang, K. Y. (1997). Sample size calculations for studies with correlated observations. Biometrics, 53(3), 937-47.

Lu, K., Luo, X. & Chen, P. (2008). Sample Size Estimation for Repeated Measures Analysis in Randomized Clinical Trials with Missing Data. The International Journal of Biostatistics, 4(1).

Corresponding BibTeX entries:

@Manual{, title = {longpower: Power and sample size calculations for linear mixed models}, author = {Michael C. Donohue}, year = {2019}, note = {R package version 1.0-19}, }

@Book{, title = {Analysis of longitudinal data}, author = {P. J. Diggle and P. J. Heagerty and K. Y. Liang and S. L. Zeger}, year = {2002}, edition = {Second Edition}, publisher = {Oxford Statistical Science Serires}, }

@Article{, title = {Sample size calculations for studies with correlated observations}, author = {G. Liu and K. Y. Liang}, year = {1997}, journal = {Biometrics}, volume = {53(3)}, pages = {937-47}, }

@Article{, title = {Sample size estimation for repeated measures analysis in randomized clinical trials with missing data}, author = {K. Lu and X. Luo and P.-Y. Chen}, year = {2008}, journal = {International Journal of Biostatistics}, volume = {4(1)}, pages = {937-47}, }