APA (7th ed.) Citation

Gillman, Bardwell, Cavedoni, & Tapp. (1998). Walking in Italy. Lonely Planet Publications.

Chicago Style (17th ed.) Citation

Gillman, Bardwell, Cavedoni, and Tapp. Walking in Italy. London: Lonely Planet Publications, 1998.

MLA (8th ed.) Citation

Gillman, et al. Walking in Italy. Lonely Planet Publications, 1998.