Shiva Purana
पद्मस्य वायुदिक्पद्मे संकल्प्य स्कान्दमासनम् ॥ स्कन्दमूर्तिम्प्रकल्प्याथ स्कन्दमावाहयेद्बुधः॥ १९॥
Fixing the Skanda seat on the lotus in the air direction of the lotus. Then the Buddha should make the idol of Skanda and invoke Skanda.
english translation
padmasya vAyudikpadme saMkalpya skAndamAsanam ॥ skandamUrtimprakalpyAtha skandamAvAhayedbudhaH॥ 19॥
hk transliteration by Sanscript