APA (7th ed.) Citation

Langdon, S. (2010). Sumerian Liturgies and Psalms. Project Gutenberg.

Chicago Style (17th ed.) Citation

Langdon, Stephen. Sumerian Liturgies and Psalms. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Langdon, Stephen. Sumerian Liturgies and Psalms. Project Gutenberg, 2010.

Warning: These citations may not always be 100% accurate.