Παραπομπή APA

Holgate, H. (1961). Exchange arithmetic/5e. Sir Isaac Pitman and sons limited.

Παραπομπή Chicago Style

Holgate, H.C.F. Exchange Arithmetic/5e. London: Sir Isaac Pitman and sons limited, 1961.

Παραπομπή MLA

Holgate, H.C.F. Exchange Arithmetic/5e. Sir Isaac Pitman and sons limited, 1961.