"Archived copy"(PDF). Archived(PDF) from the original on January 20, 2018. Retrieved October 29, 2017.{{cite web}}: CS1 maint: archived copy as title (link)
LNG World News. (2010) STX Finland and Viking Line sign agreement for cruise ferry. Retrieved December 15, 2011 from "STX Finland and Viking Line Sign Agreement for Cruise Ferry". 25 October 2010. Archived from the original on January 14, 2012. Retrieved December 18, 2011.
Wärtsilä. (2011) Wärtsilä dual-fuel power plants. Power plants. Retrieved December 15, 2011, from "Dual-fuel power plants at Wärtsilä". Archived from the original on December 19, 2011. Retrieved December 18, 2011.
Viking Line. (2011) LNG is our choice. Environment. Retrieved December 15, 2011, from www.nb1376.com
LNG World News. (2010) STX Finland and Viking Line sign agreement for cruise ferry. Retrieved December 15, 2011 from "STX Finland and Viking Line Sign Agreement for Cruise Ferry". 25 October 2010. Archived from the original on January 14, 2012. Retrieved December 18, 2011.
Wärtsilä. (2011) Wärtsilä dual-fuel power plants. Power plants. Retrieved December 15, 2011, from "Dual-fuel power plants at Wärtsilä". Archived from the original on December 19, 2011. Retrieved December 18, 2011.
Viking Line. (2011) LNG is our choice. Environment. Retrieved December 15, 2011, from www.nb1376.com
LNG World News. (2010) STX Finland and Viking Line sign agreement for cruise ferry. Retrieved December 15, 2011 from "STX Finland and Viking Line Sign Agreement for Cruise Ferry". 25 October 2010. Archived from the original on January 14, 2012. Retrieved December 18, 2011.
Wärtsilä. (2011) Wärtsilä dual-fuel power plants. Power plants. Retrieved December 15, 2011, from "Dual-fuel power plants at Wärtsilä". Archived from the original on December 19, 2011. Retrieved December 18, 2011.
Viking Line. (2011) LNG is our choice. Environment. Retrieved December 15, 2011, from www.nb1376.com
"Archived copy"(PDF). Archived(PDF) from the original on January 20, 2018. Retrieved October 29, 2017.{{cite web}}: CS1 maint: archived copy as title (link)