Earth and Its Inhabitants ...: South and east Africa, Elisée Reclus, ErnestGeorge Ravenstein, Augustus Henry Keane, D. Appleton, 1890, p. 8 Angola Tourism
[2022-02-11]. ISBN 978-3-319-23494-6. (原始内容存档于2022-04-07). George P. Rédei. Dedication: Ernest Robert Sears (1910–1991) Geneticist par Excellence, Cytogeneticist