References
Here is a repository with some pdf files for references from Edition 1 of the book (2008).
Key papers on model development and validation at STRATOS TG6 site
pdf files of more or less classic papers
Modeling strategies
Modeling strategies

Modeling strategy MDM 2001

Modeling small samples SiM 2000

Development 7 steps +
validation ABCD EHJ 2014
Validation and performance assessment
Validation and performance assessment

Performance assessment Epidemiology 2010

Internal validation JCE 2001

Calibration Achilles heel
Van Calster 2019
Validation and updating strategies
Validation and updating strategies

Updating & sample size SiM 2004

Heterogeneity in MA SiM 2019
Prognostic research as a scientific field
Prognostic research as a scientific field

PROGRESS paper #3: prognostic model research PMed 2013

Recipe for poor performance
JCE 2018
Other issues
Other issues

Framework validation
Debray JCE 2015

Personalized treatment effects
Kent BMJ 2018

TRIPOD reporting guideline 2015