Shiva Purana
वायुरुवाच एकोनविंशतिः कल्पो विज्ञेयः श्वेतलोहितः ॥ तस्मिन्कल्पे चतुर्वक्त्रस्स्रष्टुकामो ऽतपत्तपः ॥ ३ ॥
Vāyu said:— The twenty-first kalpa shall be known as Śvetalohita. In that kalpa the four-faced lord, desirous of creative activity performed a penance.
english translation
vAyuruvAca ekonaviMzatiH kalpo vijJeyaH zvetalohitaH ॥ tasminkalpe caturvaktrassraSTukAmo 'tapattapaH ॥ 3 ॥
hk transliteration by Sanscript