APA (7th ed.) Citation

ProQuest (Firm). (1878). [Extension of patents.]. [publisher not identified].

Chicago Style (17th ed.) Citation

ProQuest (Firm). [Extension of Patents.]. Washington: [publisher not identified], 1878.

MLA (9th ed.) Citation

ProQuest (Firm). [Extension of Patents.]. [publisher not identified], 1878.

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