APA-ийн эшлэл(7 дахь хэвлэлт)

Twente, E. E. (1970). Never too old: The aged in community life. Jossey Bass.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Twente, Esther E. Never Too Old: The Aged in Community Life. San francisco: Jossey Bass, 1970.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Twente, Esther E. Never Too Old: The Aged in Community Life. Jossey Bass, 1970.