Murray, L. (1815). Key to the exercises adapted to Murray's English grammar: Calculated to enable private learners to become their own instructers [!] in grammar and composition (From the 12th London ed.). New York: Collins.

Murray, Lindley. Key to the Exercises Adapted to Murray's English Grammar: Calculated to Enable Private Learners to Become Their Own Instructers [!] in Grammar and Composition. From the 12th London ed. New York: Collins, 1815.

Murray, Lindley. Key to the Exercises Adapted to Murray's English Grammar: Calculated to Enable Private Learners to Become Their Own Instructers [!] in Grammar and Composition. From the 12th London ed. New York: Collins, 1815.