Pearson G H, . (1953). Design of Valves and Fittings. London: SIR Isaac Pitman & Sons Ltd.
Pearson G H, . 1953. Design of Valves and Fittings. London: SIR Isaac Pitman & Sons Ltd.
Pearson G H, . Design of Valves and Fittings. London: SIR Isaac Pitman & Sons Ltd. 1953.