COMPLETE TITLE: Pensieri e riflessioni pratiche sopra il canto figurato. Di Giambattista Mancini, maestro di canto della corte imperiale, e Accademico filarmonico.

LATER EDITIONS:
Third edition with new title: Riflessioni pratiche sul canto figurato di Giambattista Mancini, maestro di canto dell'Imperial Corte di Vienna, Accademico Filarmonico. Rivedute, corrette, ed aumentate, Milano, Giuseppe Galeazzi, 1777 and 1778 (see).

RECENT EDITIONS:
The edition of 1777 is contained also in the book edited by Andrea Della Corte, Canto e bel canto, Torino, Paravia, 1933, along with Opinioni de' cantori antichi e moderni by Pier Francesco Tosi (see) and presents in appendix Vicende degli stili del canto dal tempo di Gluck al '900 by Andrea Della Corte.

Reprint of the third edition: Bologna, Forni, 1970 and 1996. (Anastatic reprint)

TRANSLATIONS:
English: Practical Reflections on the Figurative Art of Singing by Giambattista Mancini, Singing Master of the Imperial Court of Vienna. Translated by Pietro Buzzi Founder and Director of the Verdi School of Singing, Los Angeles, Boston, Richard G. Badger, The Gorham Press, 1912 (see). Translation of the edition of 1777 . 
Online text: INTERNET ARCHIVE

Practical Reflections on Figured Singing: the Editions of 1774 and 1777 compared, translated and edited by Edward V. Foreman, Champaign, Pro Musica Press, 1967 (see).

French: L'art du chant figuré de J.B. Mancini, Maître de Chant de la Cour Impériale de Vienne, & Membre de l'Académie des Philarmoniques de Bologne; Traduit de l'Italien par M. A. Désaugiers, A Vienne, et se trouve à Paris, Cailleau, Durand, Lacombe, Veuve Duchesne, 1776 (see).
Online text: GALLICA -
BAYERISCHE STAATSBIBLIOTHEK

Réflexions pratiques sur le chant figuré; Par J. B. Mancini, Maître de Chapelle, à Vienne; Membre de la Société Philarmonique de Bologne, Paris, Du Pont, l'an troisième de la République [1794] (see). Translation of the edition of 1777.
Online text: GALLICA - INTERNET ARCHIVE