In Jain Dharma, women during menstruation are not called “Chāṇḍālikā” in the scriptures.

• Jain texts and traditional Jain maryādā use words like “rājasvalā” (rajasvalā strī) for a menstruating woman.
• The term “Chāṇḍāla / Chāṇḍālikā” belongs to the caste–untouchability vocabulary of other traditions (mainly some Hindu Dharmashāstra literature), not to Jain āgamas or recognised Jain śrāvakācāra texts as a label for menstruating women.
• In Jainism, menstruation is treated as a matter of ritual aśaucha (temporary non‑fitness for certain pūjā/kriyā) and hygiene/ahiṁsā, never as making a woman “low caste” or “Chāṇḍālikā”.

So, to your question:

> “In which text or book are women referred to as chandalika during their periods?”

From a Jain point of view: No standard Jain scripture or recognised Jain conduct-text describes a menstruating woman as ‘Chāṇḍālikā’. If someone has said this, it is either:

1. A mixing of Hindu Dharmashāstra ideas with Jain practice, or
2. A local social belief, not based on authentic Jain āgama or classical Jain granth.

If you want to see the Jain view on menstruation and temple rules in simple language, you can read more here and here .