Hellyer, A. G. L. (1954). The encyclopaedia of plant portraits: Illustrations of cultivated plants, showing in alphabetical sequence portraits of hardy and half-hardy plants, trees and shrubs, orchids, ferns, hothouse and greenhouse plants, etc., with a short description of each. For ease of reference there is an index of common and catalogue names (Second impression.). London: W. H. And L. Collingridge Limited - Transatlantic Arts Incorporated.

Hellyer, A. G. L. The Encyclopaedia of Plant Portraits: Illustrations of Cultivated Plants, Showing in Alphabetical Sequence Portraits of Hardy and Half-hardy Plants, Trees and Shrubs, Orchids, Ferns, Hothouse and Greenhouse Plants, Etc., With a Short Description of Each. For Ease of Reference There Is an Index of Common and Catalogue Names. Second impression. London: W. H. And L. Collingridge Limited - Transatlantic Arts Incorporated, 1954.

Hellyer, A. G. L. The Encyclopaedia of Plant Portraits: Illustrations of Cultivated Plants, Showing in Alphabetical Sequence Portraits of Hardy and Half-hardy Plants, Trees and Shrubs, Orchids, Ferns, Hothouse and Greenhouse Plants, Etc., With a Short Description of Each. For Ease of Reference There Is an Index of Common and Catalogue Names. Second impression. London: W. H. And L. Collingridge Limited - Transatlantic Arts Incorporated, 1954.