Using the Rekenrek as a Visual Model for Strategic Reasoning in Mathematics
Learning to Think Mathematically with the Rekenrek
Mastering the Math Rack
Mathgains - Rekenrek
From www.edugains.ca - explains the Rekenrek and gives ideas on how to use them in the classroom.
What the Heck is a Rekenrek? - Georgia Department of Education
An Instructional tool put out by a school board in the U.S.
Rekenrek explanation video: