Hole, R. (2023). Bark-boring beetle attack in the coniferous forest of the Simla catchment area, 1907–1911. Superintendent Government Printing.
Chicago-referens (17:e uppl.)Hole, R.S. Bark-boring Beetle Attack in the Coniferous Forest of the Simla Catchment Area, 1907–1911. Superintendent Government Printing, 2023.
MLA-referens (9:e uppl.)Hole, R.S. Bark-boring Beetle Attack in the Coniferous Forest of the Simla Catchment Area, 1907–1911. Superintendent Government Printing, 2023.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.