Internal oblique, external oblique, transversus muscle

Attachments, innervation and functions of the muscles of the ventral trunk.

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External Abdominal Oblique Muscle

Musculoskeletal Sources of Abdominal and Groin Pain: Athletic Pubalgia, Hernias, and Abdominal Strains

Internal and External Oblique Muscles Anatomy: Origin, Insertion, Actions - The Wellness Digest

Transversus abdominis: Origin, insertion and function

Muscles – Advanced Anatomy 2nd. Ed.

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Abdominal Muscles - Physiopedia

Internal oblique, external oblique, transversus muscle

Ribs: Anatomy, ligaments and clinical notes