Грамматика русского языка. Часть 6. Падежи. Глава 8. Винительный падеж, множественное число, “неправильные” существительные. Russian Grammar. Part 6. Cases. Unit 8. The Accusative Plural Irregular.

Nouns which have irregular endings still follow the pattem for the accusative plural: if a noun is inanimate, the ending for the accusative plural is exactly the same as the ending for the nominative plural.

Он знает все адреса. He knows all the addresses.
Вы купили стулья? Did you buy the chairs?


Animate nouns which have an irregular nominative plural ending in a stressed а take ов in the accusative plural: Я уже знаю профессоров. The irregular nominative plural учителя becomes yчителей.
If animate nouns have an irregular nominative plural ending in ья, then the accusative plural ending is either ьев (if the nominative plural is stressed on the stem) or ей (if the nominative plural is stressed on the end):

Nominative singular	Nominative plural	Accusative plural
брат	братья nom. pl. stressed on stem	братьев
друг	друзья nom. pl. stressed on end	друзей
сын	сыновья nom. pl. stressed on end	сыновей

For animate nouns whose nominative singutar ends in нин, this is what happens:

Nominative singular	Nominative plural	Accusative plural
англичанин	англичане	англичан
гражданин	граждане	граждан

The accusative plural of the irregular feminine nouns мать and дочь are:

Nominative singular	Nominative plural	Accusative plural
дочь	дочери	дочерей
мать	матери	матерей

And finally, the accusative plural for “children” and “people” comes from their sfrikingly different nominative plural form:

Nominative singular	Nominative plural	Accusative plural
ребёнок	дети	детей
человек	люди	людей