The first one goes from North to West (CDG Airport2 - Gare du Nord - Châtelet - Versailles - St Quentin en Yvelines - La Verrière).
The second one goes from North to South (CDG Airport - Gare du Nord - Châtelet - Gare de Lyon - Gare d'Austerlitz - Evry - Corbeil/Essonnes).
You can use normal transport tickets, the Carte Orange, Paris Visite, etc as long as they are valid for the zones you are travelling in. You can also buy single tickets at an SNCF ticket office or directly on board. Note: tickets are more expensive when purchased on board and their prices may vary.
Voir la carte
Bus de Nuit - SNCF
Tel.. +33 (0) 8 10 02 02 02