APA-viite (7. p.)

Penn, . H. (1979). Estimating the plant element. Institute of Building.

Chicago-viite (17. p.)

Penn, H. Estimating the Plant Element. Ascot, Berks.: Institute of Building, 1979.

MLA-viite (9. p.)

Penn, H. Estimating the Plant Element. Institute of Building, 1979.