Cita APA (7th ed.)

Langdon, D. (2009). Spon's mechanical and electrical services price book (40th ed.). Taylor and Francis.

Cita Chicago (17th ed.)

Langdon, Davis. Spon's Mechanical and Electrical Services Price Book. 40th ed. London: Taylor and Francis, 2009.

Cita MLA (8th ed.)

Langdon, Davis. Spon's Mechanical and Electrical Services Price Book. 40th ed. Taylor and Francis, 2009.