The blood circulatory system consists of small tubular structures responsible for carrying blood known as blood vessels. Some intercellular fluid (tissue fluid), however does not re-enter capillaries or veins directly, is picked up by thin-walled blind ended lymph vessels.

What is the reference for this statement above?

The statement you've provided describes the basic function and relationship between blood vessels and the lymphatic system. This information is a well-known aspect of human physiology and can be found in most anatomy and physiology textbooks.

A commonly referenced textbook that contains similar information is "Human Anatomy & Physiology" by Elaine N. Marieb and Katja hn. Additionally, you can find information on this topic in medical encyclopedias or resources like "Gray's Anatomy for Students" by Richard Drake, A. Wayne Vogl, and Adam W. M. Mitchell.

For more precise references, you would typically consult a specific edition of one of these textbooks. If you are looking for information from peer-reviewed articles, you might search for reviews or research papers on the circulatory and lymphatic systems in databases like PubMed. However, since the statement is very general, it reflects common knowledge for which a reference may not always be directly cited in academic or professional settings.