領収書 is the standard word for a formal receipt, whereas 書き付け can refer to a simpler handwritten bill or note of charges.
Etymology
Compound of 書き (kaki, continuative form of 書く 'to write') + 付け (tsuke, continuative form of 付ける 'to attach'), literally 'writing attached'. The exact historical derivation is uncertain, but the word has been used since at least the Edo period for informal written notes and bills.