APA (7th ed.) Citation

Longman & Longman. (1987). Two days in summer. Longman ELT.

Chicago Style (17th ed.) Citation

Longman and Longman. Two Days in Summer. [England]: Longman ELT, 1987.

MLA (8th ed.) Citation

Longman and Longman. Two Days in Summer. Longman ELT, 1987.

Warning: These citations may not always be 100% accurate.