APA (7th ed.) Citation

Aitkens, I. (1931). Feldspar gems (amazon stone, moonstone, sunstone, et cetera). [publisher not identified].

Chicago Style (17th ed.) Citation

Aitkens, Irene. Feldspar Gems (amazon Stone, Moonstone, Sunstone, Et Cetera). Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Aitkens, Irene. Feldspar Gems (amazon Stone, Moonstone, Sunstone, Et Cetera). [publisher not identified], 1931.