Uture of transportation/ alternating fuel in the future .50 years later.
use IEEE format instead of MLA.
need main headings and sub headings
main heading will be : land transportation, air transp, water transp, and outer-space trasp and alternating fuel(hydrogen fuel cell)
sub headings should be under each main headings. for example for the land transportation the cars, train , bicycle, bus will be under the land transportation.
~~for references i need some books and articles