(1966). Motivation. England: Penguin Book.
Trích dẫn kiểu ChicagoMotivation. England: Penguin Book, 1966.
ציטוט MLAMotivation. England: Penguin Book, 1966.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.
(1966). Motivation. England: Penguin Book.
Trích dẫn kiểu ChicagoMotivation. England: Penguin Book, 1966.
ציטוט MLAMotivation. England: Penguin Book, 1966.