APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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