Gaya APA

Fretag, J, C., Matulionis, R, P. (1991). Preventive maintenance of buildings / editor, Raymond C. Matulionis, Joan C. Freitag . New York: Van Nostrand Reinhold.

Gaya MLA

Fretag, John, C.., Matulionis, Raymond, P.. "Preventive maintenance of buildings / editor, Raymond C. Matulionis, Joan C. Freitag". New York: Van Nostrand Reinhold, 1991. Textbook.