Hans Alexander Kneider, Deutsche Persönlichkeiten im Königreich Joseon, vol. 5, , 84–85 p. (lire en ligne), chap. 1; available in English as: Remarkable Germans in the Choson Kingdom, Séoul, German Embassy in the Republic of Korea (lire en ligne)
koreana.or.kr
Hans Alexander Kneider, Deutsche Persönlichkeiten im Königreich Joseon, vol. 5, , 84–85 p. (lire en ligne), chap. 1; available in English as: Remarkable Germans in the Choson Kingdom, Séoul, German Embassy in the Republic of Korea (lire en ligne)
koreatimes.co.kr
Robert Neff, First gentlemen’s club in Seoul established in 1889, (lire en ligne)
korusforum.org
(ru) M. Volkov, Русские в Корее- имена и судьбы (Russians in Korea : Names and Fates), vol. 23, Center for Contemporary Korean Studies, Russian Academy of Sciences, (lire en ligne)