APA
Gerhardt F., SSPA Sweden AB S. f. e. o. 5., . (2021110120241231). International Benchmark Campaign on Added Resistance. : Trafikverket.
Chicago
Gerhardt Frederik, SSPA Sweden AB Svenskt företag eller organisation 556224-1918, . 2021110120241231. International Benchmark Campaign on Added Resistance. : Trafikverket.
Harvard
Gerhardt F., SSPA Sweden AB S. f. e. o. 5., . (2021110120241231). International Benchmark Campaign on Added Resistance. : Trafikverket.
MLA
Gerhardt Frederik, SSPA Sweden AB Svenskt företag eller organisation 556224-1918, . International Benchmark Campaign on Added Resistance. : Trafikverket. 2021110120241231.