CITROËN DS 4 Handbook page 160

ISOFIX child seats recommended by CITROËN
CITROËN offers a range of ISOFIX child seats listed and type approved for your vehicle.
Refer also to the child seat manufacturer's fitting instructions for information on installing and removing the seat.
"RÖMER Baby-Safe Plus" and its ISOFIX base
(size category: E)
Group 0+: from birth to 13 kg
Installed rearward facing using an ISOFIX base which is attached to the rings A.
The base has a support leg, adjustable for height, which sits on the vehicle's floor.
This child seat can also be secured with a seat belt. In this case, only the shell is used and
attached to the vehicle's seat by the three-point seat belt.
Baby P2C Mini and its ISOFIX base
(size categories: C, d, E)
Group 0+: from birth to 13 kg
Installed rearward facing using an ISOFIX base which is attached to the anchorage rings A.
The base has a support leg, adjustable for height, which sits on the vehicle's floor.
This seat can also be secured with a seat belt. In this case only the seat shell is used.