A concise comparative Celtic grammar,
by Henry Lewis and Holger Pedersen.

APA Citation

Lewis, H., Pedersen, H. (19611974). A concise comparative Celtic grammar. 3d ed. Gottingen: Vandenhoeck & Ruprecht.

MLA Citation

Lewis, Henry, b. 1889, and Holger Pedersen. A Concise Comparative Celtic Grammar. 3d ed. Gottingen: Vandenhoeck & Ruprecht, 19611974.

Warning: These citations may not always be complete (especially for serials).