Gaya APA

Matulionis, R, P., Fretag, J, C. (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.