Παραπομπή APA

R.W, H. (1981). Mortgage Banking. Morgage bankers Association.

Παραπομπή Chicago Style

R.W, Helgerson. Mortgage Banking. America: Morgage bankers Association, 1981.

Παραπομπή MLA

R.W, Helgerson. Mortgage Banking. Morgage bankers Association, 1981.