ISBN 978-0-8050-9299-8 参见 JaroslavKraft, Czech palaeontologist and a specialist in dendroid graptolites(英语:JaroslavKraft) Classification of the Cephalodiscoidea
Context. snaccooperative.org. [15 October 2023]. (原始内容存档于2024-03-28). Jaroslav Cejp. worldfootball.net. [15 October 2023]. (原始内容存档于2023-10-30). Olympedia
Dies; Played 3 Different Instruments JOSEPH KRAFT, THE JOURNALIST, DIES; CAPITAL COLUMNS WIDELY PRINTED JAROSLAV SEIFERT, CZECH POET, IS DEAD STATE SEN. BLOOM