APA

Octel, . (1961). Present status of exhaust valve materials used in 4 - cycle engines for passenger cars manufactured in Europe. London: Octel.

Chicago

Octel, . 1961. Present status of exhaust valve materials used in 4 - cycle engines for passenger cars manufactured in Europe. London: Octel.

Harvard

Octel, . (1961). Present status of exhaust valve materials used in 4 - cycle engines for passenger cars manufactured in Europe. London: Octel.

MLA

Octel, . Present status of exhaust valve materials used in 4 - cycle engines for passenger cars manufactured in Europe. London: Octel. 1961.