Prostate-Specific Antigen (PSA Test): Questions & Answers (2017). National Cancer Institute Member Services.
Chicago-viite (17. p.)Prostate-Specific Antigen (PSA Test): Questions & Answers (2017). National Cancer Institute Member Services.
MLA-viite (9. p.)Prostate-Specific Antigen (PSA Test): Questions & Answers (2017). National Cancer Institute Member Services.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.