APA

Hayes F. E., Hayes W. K., Beaman K. R. & Harris L. E. (1992). Sleep-like behaviour in the Galapagos tortoise (Geochelone elephantopus). : .

Chicago

Hayes Floyd E, Hayes William K, Beaman Kent R and Harris Lester E. 1992. Sleep-like behaviour in the Galapagos tortoise (Geochelone elephantopus). : .

Harvard

Hayes F. E., Hayes W. K., Beaman K. R. and Harris L. E. (1992). Sleep-like behaviour in the Galapagos tortoise (Geochelone elephantopus). : .

MLA

Hayes Floyd E, Hayes William K, Beaman Kent R and Harris Lester E. Sleep-like behaviour in the Galapagos tortoise (Geochelone elephantopus). : . 1992.