Mepụta nsụgharị dị mgbagwoju anya nke ahịrịokwu a Anne Edwards'biography of Maria Callas (''Callas ', 2001) na Peter Evans biography of Aristotle Onassis na-ekwu na Maxwell mere ka Callas mata Onassis.
N'ezie, ụdị ahịrịokwu dị mgbagwoju anya bụ "Akwụkwọ akụkọ ndụ Anne Edwards nke Maria Callas (' 'Callas', 2001) na-ekwu na Maxwell mere ka Callas mata Aristotle Onassis, nakwa na Maxwell bụ nwanyị nwere mmasị nwanyị nke gbalịrị ịrata Callas n'onwe ya. "