Newmarch, Rosa (ed)(1905). The life and letters of Peter Ilich Tchaikovsky (Lane : London)
Sundkvist, Luis (trans)(2009) via Tchaikovsky Research project (tchaikovsky-research.net)
Griegforeningen i Skottland – the Scottish Dimension of Edvard and Nina Grieg
Newmarch, Rosa (ed)(1905). The life and letters of Peter Ilich Tchaikovsky (Lane : London)
Sundkvist, Luis (trans)(2009) via Tchaikovsky Research project (tchaikovsky-research.net)