APA
Great Portland Estates PLC, . (1984). The first twenty-five years. London: Great Portland Estates.
Chicago
Great Portland Estates PLC, . 1984. The first twenty-five years. London: Great Portland Estates.
Harvard
Great Portland Estates PLC, . (1984). The first twenty-five years. London: Great Portland Estates.
MLA
Great Portland Estates PLC, . The first twenty-five years. London: Great Portland Estates. 1984.
