Kitāba is an accusative direct object as well as muḍāf; aṭ-ṭālibi is genitive as muḍāf ilayh.
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Iḍāfah and Case
Comprehensive Review: Applied Arabic Parsing
Kitāba is an accusative direct object as well as muḍāf; aṭ-ṭālibi is genitive as muḍāf ilayh.