Bleifeld, W. (1 February 1976). "[Letter: Beta-receptor blockaders in intraventricular conduction disorders?]". Deutsche Medizinische Wochenschrift. 101 (7): 264–265. ISSN0012-0472. PMID2456.
Olszewska, Zuzanna (1 November 2015). The Pearl of Dari : Poetry and Personhood among Young Afghans in Iran. Bloomington. ISBN9780253017635. OCLC936338723.{{cite book}}: CS1 maint: location missing publisher (link)
Bleifeld, W. (1 February 1976). "[Letter: Beta-receptor blockaders in intraventricular conduction disorders?]". Deutsche Medizinische Wochenschrift. 101 (7): 264–265. ISSN0012-0472. PMID2456.