Francogallice et Bretonice in tres classes communiter dividuntur, scilicet douces, dous ("dulces"), acides, trenk ("acidae"), amères, c'hwerv ("amarae"); recentius autem quinque divisiones in Francia enumerantur:[1]
A. Andouard et al., "Notes sur les pommes à cidre" in Annales de la Société académique de Nantes et du département de la Loire-Inférieure ser. 6 vol. 6 (1885) pp. 132-170 Textus apud archive.org
Liz Copas, A Somerset Pomona: the cider apples of Somerset. Dovecote Press, 2001. ISBN 978-1874336877
William Coxe, A view of the cultivation of fruit trees, and the management of orchards and cider; with accurate descriptions of the most estimable varieties of native and foreign apples, pears, peaches, plums, and cherries, cultivated in the middle states of America: illustrated by cuts of two hundred kinds of fruits of the natural size. Philadelphiae: M. Carey, 1817 Textus apud archive.org
John Evelyn et alii, "Pomona, or an appendix concerning fruit-trees in relation to cider" in John Evelyn, Sylva, or a discourse of forest-trees and the propagation of timber in His Majesties dominions (Londinii: Royal Society, 1664) Textus apud archive.org
Robert Hogg, Henry Graves Bull, The apple and pear as vintage fruits. Herefordiae, 1886 Textus apud archive.org
Robert Hogg, Henry Graves Bull, The Herefordshire Pomona. Herefordiae, 1878-1885 De hoc opere
George Lindley; Michael Floy, ed., A guide to the orchard and fruit garden: or, An account of the most valuable fruits cultivated in Great Britain (Novi Eboraci: Collins & Hannay, 1833) pp. 75-90 Textus apud google books