On the origin of her catchphrase "Azúcar"; from a 2000 interview quoted in “Celia Cruz, 77; Queen of Salsa’s Passing Marks the End of a Musical Era” https://www.latimes.com/archives/la-xpm-2003-jul-17-me-cruz17-story.html in Los Angeles Times (2003 Jul 17).
The quote is discussed in Why Did Celia Cruz Say, "Azúcar"? https://www.youtube.com/watch?v=ZaHb_ms1YkAWhy in the Smithsonian Music Channel.
Celia Cruzová: Citáty anglicky
On the gender stereotypes surrounding salsa singers in “CELIA CRUZ: AT THE TOP OF SALSA” https://www.nytimes.com/1985/11/19/arts/celia-cruz-at-the-top-of-salsa.html in New York Times (1985 Nov 19).
On what she hopes for her audience in “CELIA CRUZ: AT THE TOP OF SALSA” https://www.nytimes.com/1985/11/19/arts/celia-cruz-at-the-top-of-salsa.html in New York Times (1985 Nov 19).
Pues la viejita no se equivocó.
On her first time singing, part of her Interview with Generación Ñ http://generation-ntv.com/writing/celia-cruz-1996 in 1996.
A similar statement in shown in the BBC Arena documentary "My Name Is Celia Cruz" https://www.bbc.co.uk/programmes/b00qmxcl from 1988.