P., M., R., C., F., J.(1991).Preventive maintenance of buildings / editor, Raymond C. Matulionis, Joan C. Freitag .New York:Van Nostrand Reinhold.
Gaya MLA
Matulionis, Raymond, P.., Fretag, John, C.."Preventive maintenance of buildings / editor, Raymond C. Matulionis, Joan C. Freitag".New York:Van Nostrand Reinhold,1991.Textbook.