1) Bootstrapping Regression Models by John Fox (link)
2) Bootstrapping methods for standard errors, confidence intervals, and other measures of statistical accuracy (Efron and Tibshirani)
3) Stat 5102 Notes: Fisher Information and Confidence Intervals Using Maximum Likelihood by Charles Geyer (link)
4) PARAMETRIC BOOTSTRAP INTERVAL APPROACH TO INFERENCE FOR FIXED EFFECTS IN THE MIXED LINEAR MODEL
BY Vincent S. Staggs