Analysis of information sources in references of the Wikipedia article "Sakhalin" in English language version.
{{cite web}}
: CS1 maint: multiple names: authors list (link){{cite book}}
: CS1 maint: multiple names: authors list (link)The Russians had established a penal colony in northern Sakhalin in 1857 [...].
{{cite web}}
: CS1 maint: multiple names: authors list (link)"I made my trips around Sakhalin Island in autumn and winter ...": reports of Lieutenant N. V. Rudanovskiy. 1853–1854