APA (7th ed.) Citation

Trinity key by H.B.Stephens. EMPR. nACIONAL. DE publi. LISBON.

Chicago Style (17th ed.) Citation

Trinity Key by H.B.Stephens. Portugal: EMPR. nACIONAL. DE publi. LISBON.

MLA (8th ed.) Citation

Trinity Key by H.B.Stephens. EMPR. nACIONAL. DE publi. LISBON.

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