1- For references have a look over.

For Modalities:

Clayton's Electrotherapy 9th Edition by Forster and Palastanga

For Cervical Traction:

Therapeutic exercises, Foundation and Techniques, Third Edition by Carolyn Kisner & Lynn Allen Colby - Chapter on Spinal Traction

http://www.thesaundersgroup.com/cervical.pdf

For Exercises on McKenzie:

McKenzie Mechanical Diagnosis And Therapy

For Cervicothoracic Stabilization:

Neck school: cervicothoracic stabilization training.

An overview of functional progressions in the rehabilitation of patients with cervical dysfunction

Active Treatment of Chronic Neck Pain: A Prospective Randomized Intervention.

Rehabilitation – a valuable consideration n acute and chronic neck and low back pain

Cognitive behavioural components in physiotherapy management of chronic whiplash associated disorders (WAD) - a randomised group study

REHABILITATION OF THE COMBATANT With Musculoskeletal Disorders

Spinal Mobilization and Manipulation:

Spinal Manipulation its safety is uncertain

Spinal Mobilization: concurrents effects on pain, sympathetic nervous system and motor Activity

Influence of Cervical Mobilization of respiratory and cardiovascular system activity

Mobilization of Spine by G.P.Grieve

Texbook of Orthopaedic Medicine, Treatment by Manipulation , massage and injection , 11th Edition by Cyriax & Coldham

Neuromobilization:

Mobilization of Nervous system by David Butler

Therapeutic Exercises, Foundation and techniques, 4th Edition, by Kisner & Colby - Neural Tension Techniques, Chapter on Spine

Mobilization of Spine By G.P.Grieve - Neural tension Techniques

Functional Restoration & Aerobics:

Therapeutic exercises, Foundations and Techniques, 4th edition By Kisner & Colby

Sports Medicine Secrets, 3rd edition by Mellion, Putukian & Madden

2- Any patient with chronic pain problems may present with yellow flags and central sensitization but I think that patient is presenting with Physical problems as you may determine his problems by eleiciting the clinical signs like spurling maneuver and other tests for cervical and lumbar spine.