Esperanto (The universal language) :
the student's complete text book, containing full grammar, exercises, conversations, commercial letters, and two vocabularies /
compiled by J.C. O'Connor.

APA Citation

Zamenhof, L. L. (Ludwik Lazar)., O'Connor, J. C. (John Charles). (19071903). Esperanto (The universal language): the student's complete text book, containing full grammar, exercises, conversations, commercial letters, and two vocabularies. Rev. ed. New York: Fleming H. Revell Company.

MLA Citation

Zamenhof, L. L. (Ludwik Lazar), 1859-1917, and J. C. (John Charles) O'Connor. Esperanto (The Universal Language): the Student's Complete Text Book, Containing Full Grammar, Exercises, Conversations, Commercial Letters, And Two Vocabularies. Rev. ed. New York: Fleming H. Revell Company, 19071903.