APA
National Association of Realtors, . (1993). Profile of real estate firms: 1992. Washington, DC: National Association of Realtors.
Chicago
National Association of Realtors, . 1993. Profile of real estate firms: 1992. Washington, DC: National Association of Realtors.
Harvard
National Association of Realtors, . (1993). Profile of real estate firms: 1992. Washington, DC: National Association of Realtors.
MLA
National Association of Realtors, . Profile of real estate firms: 1992. Washington, DC: National Association of Realtors. 1993.