LEGO Technic Mindstorm NXT Electric Motor 9V Mini-Motor 1pc | eBay
BrickLink - Part 2986 : LEGO Electric, Motor 9V Micromotor 2 x 2 [Electric, Motor] - BrickLink Reference Catalog
BrickLink - Part 71427c01 : LEGO Electric, Motor 9V Mini-Motor, Heavier Weight [Electric, Motor] - BrickLink Reference Catalog
LEGO 9V Technic Motors compared characteristics
Amazon.com: LEGO Functions Power Functions XL-Motor 8882 (1 Piece) : Toys & Games
LEGO Technic 9 V 9 Volt Motor – Strong Pressure – Lego technique power motor in Light Grey – Can Be Used With The Current Motors, Cables: Amazon.de: Toys
LEGO 8735: Motor Set, 9V | Brickset: LEGO set guide and database