Bulgarian occupation of Serbia (World War I)

在第一周的壕溝戰中，塞爾維亞烏日策軍團（一個加強師）及蒙特內哥羅桑扎克軍團（約一個師）對波士尼亞地區發起了一次流產的攻勢。此外，雙方發起來幾次局部攻擊，但多數都以失敗告終。 World War I: encyclopedia. S - Z, Vol.4, Ed. Spencer Tucker, (ABC-CLIO, 2005), 366

Oxford illustrated history of the First World War. Oxford University Press. 2014. ISBN 978-0199663385.  Spencer C Tucker. World War I: A Student Encyclopedia

Alan. How America Won World War I. Rowman & Littlefield. 2018. ISBN 978-1493031924.  Albertini, Luigi. Origins of the War of 1914 II. Oxford: Oxford

Andrej. Serbia's Great War, 1914-1918. West Lafayette, Indiana: Purdue University Press. 2007. ISBN 978-1-5575-3476-7.  Willmott, H. P. World War One. Dorling

evacuation of the Serbian Army. Military Casualties-World War-Estimated," Statistics Branch, GS, War Department, 25 February 1924; cited in World War I: People