Aars, Jonathan; Hofgaard, Simon Wright (1907). Norske retskrivnings-regler med alfabetiske ordlister (in Norwegian). W. C. Fabritius & Sønner. pp. 19, 84. NBN 2006081600014. Archived from the original on February 18, 2022. Retrieved September 18, 2011.
Trần Tư Bình (November 30, 2013). "Viết tắt chữ Việt trong ngôn ngữ @". Chim Việt Cành Nam (in Vietnamese) (53). Archived from the original on February 28, 2014. Retrieved April 15, 2014.
"Ordlista". Archived from the original on August 24, 2012. Retrieved January 29, 2015., page 1098
Aars, Jonathan; Hofgaard, Simon Wright (1907). Norske retskrivnings-regler med alfabetiske ordlister (in Norwegian). W. C. Fabritius & Sønner. pp. 19, 84. NBN 2006081600014. Archived from the original on February 18, 2022. Retrieved September 18, 2011.
Trần Tư Bình (November 30, 2013). "Viết tắt chữ Việt trong ngôn ngữ @". Chim Việt Cành Nam (in Vietnamese) (53). Archived from the original on February 28, 2014. Retrieved April 15, 2014.