vedyog.net

In English:

Swami Dayanand Saraswati Commentary : The ancient Aitareya, Shatpath Brahman, and others, written by Seers and Saints, and are books of true knowledge, are called 'Puranas, Itihasa, Kalpa, Gatha and Narashansi'.

Comment in English : The four Brahman Granthas are — (1) Aitareya (of Rigveda), (2) Shatapatha (of Yajurveda), (3) Saama (of Saamaveda), and (4) Gopatha (of Atharvaveda).

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In Hindi:

महर्षि दयानन्द व्याख्या : जो प्राचीन ऐतरेय, शतपथ ब्राह्मणादि ऋषि-मुनिकृत सत्यार्थ पुस्तक हैं, उन्हीं को 'पुराण, इतिहास, कल्प, गाथा और नाराशंसी' कहते हैं।