Nikos Petsalis-Diomidis
The book by Nikos Petsalis-Diomidis,
the result of many years of research and documentation,
is one of the most authoritative studies
on Callas’ life and career in Greece.
- The unknown Callas, Nikos Petsalis-Diomidis, Athens, 1998 [in Greek]
- Τhe Unknown Callas. The Greek Years, Nicholas Petsalis-Diomidis, foreword by Lord Harewood, Portland (USA), 2001 (Proofs of the 1st edition in English.)
- The Unknown Callas.The Greek Υears, Nicholas Petsalis-Diomidis, foreword by Lord Harewood,Portland (USA), 2001 (1st English edition)
- La Callas inconnue, Nicolas Petsalis-Diomidis, Paris, 2002
- La Callas desconocida, Nicolás Petsalis-Diomidis, Leida (Spain) 2005