Gaya APA

Petrunin, M. (2018). E-Book Comparative Grammar of Spanish and Portuguese: Learn & Compare 2 Languages Simultaneously (With Useful Phrases to Survive a Conversation) . : Independently published.

Gaya MLA

Petrunin, Mikhail. "E-Book Comparative Grammar of Spanish and Portuguese: Learn & Compare 2 Languages Simultaneously (With Useful Phrases to Survive a Conversation)". : Independently published, 2018. Text.