Boyd-Bowman, P. (2007). Stanley Martin Sapon, A study of the development of the interrogative in Spanish from the twelfth through the fifteenth centuries. Columbus, Ohio, 1951. 99 págs. El Colegio de México.
Cita Chicago Style (17a ed.)Boyd-Bowman, Peter. Stanley Martin Sapon, A Study of the Development of the Interrogative in Spanish from the Twelfth Through the Fifteenth Centuries. Columbus, Ohio, 1951. 99 Págs. El Colegio de México, 2007.
Cita MLA (9a ed.)Boyd-Bowman, Peter. Stanley Martin Sapon, A Study of the Development of the Interrogative in Spanish from the Twelfth Through the Fifteenth Centuries. Columbus, Ohio, 1951. 99 Págs. El Colegio de México, 2007.
警告：這些引文格式不一定是100％准確.