(1976). Spon's mechanical and electrical services price book (7th ed.). London: E. & FN. Spon.
Παραπομπή Chicago StyleSpon's Mechanical and Electrical Services Price Book. 7th ed. London: E. & FN. Spon, 1976.
Παραπομπή MLASpon's Mechanical and Electrical Services Price Book. 7th ed. London: E. & FN. Spon, 1976.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.