pei, m. (1981). The lexicon Webster dictionary: With a historical sketch of the English language. English-Language Institute of America.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումpei, mario. The Lexicon Webster Dictionary: With a Historical Sketch of the English Language. [Chicago]: English-Language Institute of America, 1981.
MLA (9րդ խմբ.) Մեջբերումpei, mario. The Lexicon Webster Dictionary: With a Historical Sketch of the English Language. English-Language Institute of America, 1981.