Gaya APA

Kohan, A, L., Spring, H, M, J. (1991). Boiler operator s guide. (1991). : New York : McGraw-Hill, Inc..

Gaya MLA

Kohan, Anthony, Lawrence., Spring, Harry, M.,, Jr.. "Boiler operator s guide.". 1991 : New York : McGraw-Hill, Inc., 1991. Text.