Your book is correct that plants can be cloned via a single leaf ,problem is that if you try to clone a fan leaf from a mj plant all you will get is a nicely rooted fan leaf that wont grow out into a full plant.
Plants with complex structures like a node on a mj plant do not contain the cell structure needed to replicate itself within the leaf matter.
The cells needed to grow out a full plant are locked within the vein of the leaf,cloning a mj plant via a fan leaf is possible but not in a classic sense,the leaf needs to lay flat on top the medium & needs to root from the veins of the leaf instead of the leaf stalk.
Then what you get is a goofy ass looking lump of roots that if you can keep alive long enough will shoot up little sprouts that resemble a mj seedling.
A botanist who is a member here talked a few members & myself into trying it a few years back,we were experimenting with different growth hormones when he suggested the fan leaf deal ,we spent an entire year fukin round with fan leaf cloning & found out its a bitch to pull off,after about 6 months & dozens of failures I got a few leaves to root via the veins ,but only 1 took hold & grew a root mass,i never did get a plant to pop out of the root mass,i forgot to adjust the temp in the incunator & the root mass molded over,i was all kinda pissed & gave up.
Its possible but the cloning process dosent even remotely resemble just sticking a leaf stalk in hormones & your off n running,its alot of precise work involving incubators,total sterile medium & growth chambers as well as sterile hormones,its just too much work when standard cloning techniques are so simple with extremely high success rates.
Dont waste your time unless your into the science behind it all.