(1999). UPSC (IES) Engineering Services Examination Papers, Solved and Unsolved: Civil Engineering. G.K.
Παραπομπή Chicago StyleUPSC (IES) Engineering Services Examination Papers, Solved and Unsolved: Civil Engineering. Jabalpur: G.K, 1999.
Παραπομπή MLAUPSC (IES) Engineering Services Examination Papers, Solved and Unsolved: Civil Engineering. G.K, 1999.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.