Bulugahapitiya, D. U.; Satarasinghe, R. L. (3 de setembro de 2003). «Blood group distribution in Sri Lanka». The Ceylon Medical Journal. 48 (3): 95–96. PMID14735811. doi:10.4038/cmj.v48i3.3358
«Groupes sanguins». Institut National de la Transfusion Sanguine (em francês). Institut National de la Transfusion Sanguine. Consultado em 16 de abril de 2021
Bashwari, Layla A.; Al-Mulhim, Abdul Az; Ahmad, Malik S.; Ahmed, Mohammed A. (2001). «Frequency of ABO blood groups in the eastern region of Saudi Arabia». Saudi Medical Journal. 22 (11): 1008–12. ISSN0379-5284. PMID11744976
Bulugahapitiya, D. U.; Satarasinghe, R. L. (3 de setembro de 2003). «Blood group distribution in Sri Lanka». The Ceylon Medical Journal. 48 (3): 95–96. PMID14735811. doi:10.4038/cmj.v48i3.3358
Dean 2005, 2.1.4: Blood Type A: Central and Eastern EuropeType A is common in Central and Eastern Europe. In countries such as Austria, Denmark, Norway, and Switzerland, about 45–50% of the population have this blood type, whereas about 40% of Poles and Ukrainians do so. The highest frequencies are found in small, unrelated populations. For example, about 80% of the Blackfoot Indians of Montana have blood type A ...
Bashwari, Layla A.; Al-Mulhim, Abdul Az; Ahmad, Malik S.; Ahmed, Mohammed A. (2001). «Frequency of ABO blood groups in the eastern region of Saudi Arabia». Saudi Medical Journal. 22 (11): 1008–12. ISSN0379-5284. PMID11744976